PSE Limb Vise Tuning System: How It Works & How to Adjust It

If you've ever been paper tuning a bow and gotten down to that last little eighth-inch tear, you know how frustrating it can be. The bow is close, but you still want to clean it up without chasing your rest around or putting the bow back in the press.

That's where PSE's new Limb Vise Tuning System comes in.

With the new 2027 bows including the PSE Odin 34 and Odin Sub 30, you've got two different places to make tuning adjustments. You can make your larger cam adjustments in the rear with the EZ.220 shim system, then use the Limb Vise in the limb pocket for smaller corrections without a bow press.

We spent some time working with this system at Extreme Outfitters, changing shim configurations and shooting through paper to see what actually happens. I'm going to walk you through how the system works, which direction the shims move, and what we saw during our testing.

Watch: PSE Limb Vise Tuning System Explained

In this video, I'm working directly on the new PSE bows, showing how the EZ.220 shims come in and out, how the limb-pocket adjustment works, and what happens when we deliberately change the shim configuration and shoot through paper.

How the PSE Limb Vise Tuning System Works

The thing you have to understand about the new PSE tuning system is that you have two different adjustments doing two different jobs.

For me, the biggest advantage is having that secondary adjustment available once the bow is already close.

Instead of continually changing cam shims in a press or moving the rest away from a good starting position, I can make a smaller correction at the limb pocket and see what it does through paper.

That doesn't mean the Limb Vise replaces proper bow setup. Your rest position, cam timing, arrow setup, and shooting form still matter. You have to look at the complete system.

Understanding the PSE EZ.220 Shim Configurations

Both adjustment systems use PSE's EZ.220 shim configurations.

One of the changes PSE introduced with the new bows is the 110 shim. That gives us four different shim pairings to work with.

Every pairing totals 220. That's important. You aren't adding or removing total shim thickness. You're changing how that thickness is distributed.

Also remember that you can reverse the orientation of an unequal pair. A 100/120 setup and a 120/100 setup have the same total thickness, but they place the larger shim on opposite sides.

The actual effect on the paper tear depends on the bow and the rest of the setup.

Step 1: Make Your Larger Tuning Adjustments at the Rear Cam

When I'm starting with one of these bows, I want to see what it's doing through paper before I start changing anything.

If I've got a significant tear that we've determined requires cam alignment correction, I'm going to start with the rear EZ.220 shim system.

That's where we make our bigger move.

On the example in the video, we discuss moving the cam left by positioning the larger rear shim on the right. That's how the cam-shimming adjustment works on the setup we're demonstrating.

But I don't want somebody to take that as a blanket instruction to move shims solely because they see a certain paper-tear direction.

Once we've made the major correction and we're down to a small remaining tear, that's when I like to use the Limb Vise.

The advantage is that we can make another fine adjustment without having to press the bow again.

Step 2: How to Adjust the PSE Limb Vise

This is the part of the new system I really like. Once you understand how the shims work, the process is straightforward.

The following is the process demonstrated in our video. Use the current PSE instructions for your exact bow to confirm the approved adjustment procedure, hardware sequence, and torque requirements.

What I like about this system is that once you have the shim configurations and the right tool, you can make these fine adjustments without repeatedly putting the bow in the press.

But don't confuse a simple adjustment with one that doesn't require care. The shims need to be fully seated, and the limb-pocket hardware needs to be properly secured before the bow is shot.

Which Direction Do You Move the PSE Limb Vise Shims?

Here's where I think people are going to get tripped up when they first start tuning these bows.

In our demonstrated setup, the Limb Vise correction works opposite to the rear cam-shimming move.

Let's say we're working with a nock-left tear and have determined that the correct adjustment is to move the rear cam to the left.

So if I've got an 80/140 configuration at the rear with the 140 on the right, and I'm using a 100/120 configuration in the Limb Vise to make that additional correction, the 120 goes on the left.

That's the relationship I want you to understand.

But again, these are adjustment directions from the bow and tuning situation we're demonstrating. They're not a substitute for diagnosing why a bow is producing a particular tear in the first place.

Verify your adjustment direction against the bow's response, confirm your reference perspective, and remember that moving the shims isn't the only variable that affects arrow flight.

Our Real-World Paper Tuning Results

Now let's get into what happened when we actually tested this system.

We had a PSE Odin Sub 30 already tuned and shooting a good bullet hole through paper.

Instead of leaving it alone, we deliberately made a larger adjustment to the Limb Vise to see how much the paper tear would change.

That's a pretty noticeable change from a system designed primarily for smaller corrections.

And here's why I think it's useful.

We didn't have to change the arrow rest or go back into the rear cam shims to produce that difference. We changed the Limb Vise configuration, shot the same bow through paper again, and saw the result.

How Much Adjustment Does Each Shim Configuration Give You?

In the video, I talk about getting roughly an eighth-inch change through paper from smaller shim adjustments and potentially having around a half-inch of total adjustment available across the configurations.

That's a working estimate based on what we were seeing, not a measured manufacturer specification.

Our clearly demonstrated result was approximately a quarter-inch change when moving from 100/120 to 60/160 on the test bow.

Different bows, arrow setups, rest positions, and shooting conditions can produce different results. I wouldn't automatically assume every shim change is going to create exactly the same size tear correction.

Common Mistakes When Tuning the PSE Limb Vise

After working with the system, there are a few things I'd pay attention to, especially if you're doing the tuning yourself.

1. Not Fully Seating the Shims

The snap-in design is easy to work with, but you still need to verify that each shim is installed correctly. An audible pop is useful feedback, but it doesn't replace checking that everything is seated.

2. Leaving a Gap in the Limb Vise Assembly

This is something I specifically emphasize in the video. The system needs to be closed and secured correctly for the adjustment to work as intended. Don't leave loose hardware or an improperly seated assembly and then shoot the bow.

3. Confusing Rear and Front Shim Direction

The rear cam adjustment and the front limb-pocket adjustment affect alignment differently. Pay attention to where the larger shim goes and make sure you're following the correct procedure for the location you're adjusting.

4. Trying to Fix Everything with the Limb Vise

This is intended to provide additional fine-tuning control. If the bow has a substantial underlying setup problem, don't expect the Limb Vise alone to solve it. Check the basic setup first and use the rear cam-shim system when appropriate.

5. Chasing a Single Paper Tear

One bad shot doesn't necessarily mean the bow needs another adjustment. Make sure you're getting repeatable results before changing anything. Grip pressure, release execution, arrow setup, and rest position can all affect what you're seeing.

6. Assuming a Bullet Hole Means You're Completely Done

A clean paper tear is a good sign, but it's not the entire tuning process. I still want to verify how the bow shoots with the actual arrows and broadheads I'm planning to hunt with.

My Recommended Tuning Process

If somebody comes into the shop with one of these new PSE bows, I don't want to start swapping shims just because I can.

I want to work through the bow in a logical order.

Where people get this wrong is treating every adjustment as its own separate fix. The rest, cam alignment, limb alignment, arrows, and shooter all work together.

The Limb Vise is another tool to help you get the system working correctly. That's how I look at it.

PSE Limb Vise Tuning FAQ

Can you tune a PSE Odin without a bow press?

You can make supported fine-tuning adjustments using the Limb Vise without a bow press. However, rear cam-shim changes still require a press, and other bow maintenance or setup operations may require one as well.

What is the difference between EZ.220 and Limb Vise?

EZ.220 is PSE's shim system. The new bows use EZ.220 configurations at the rear cam and within the Limb Vise assembly. Rear cam shimming adjusts the cam position, while the Limb Vise provides a separate limb-pocket alignment adjustment.

What shim combinations work with the PSE Limb Vise?

The configurations demonstrated are 60/160, 80/140, 100/120, and 110/110. Each pair totals 220, with unequal pairs allowing different left-to-right orientations.

How much can the Limb Vise change a paper tear?

In our Odin Sub 30 test, switching from 100/120 to 60/160 moved the paper result approximately a quarter inch. The actual effect varies by setup, so this should be treated as an observed result rather than a guaranteed adjustment amount.

Does the Limb Vise replace moving the arrow rest?

No. It provides another tuning adjustment. Rest alignment still matters, and you should diagnose the complete setup before deciding which adjustment to make.

Which PSE bows use the new Limb Vise system?

The system is featured on the PSE Odin 34 and Odin Sub 30 platforms covered in this guide. Check the specifications of your particular bow to confirm its tuning hardware.

Bottom Line: Is PSE Limb Vise Worth It?

After working with the new Limb Vise system, I like what PSE has done here.

We've had the EZ.220 system for making cam adjustments, and that's already a useful design. Now having another adjustment at the limb pocket gives us more control over those smaller tuning changes without needing to put the bow back into a press every time.

Our testing on the Odin Sub 30 showed that changing the shim configuration could produce a real, measurable difference through paper. That's what matters to me.

It's also a simple system once you understand how it works. The shims pop in and out, the numbers are easier to read, and the ability to make these changes without a press is a nice improvement.

Just remember the important stuff: make your larger corrections at the rear when appropriate, use the Limb Vise for fine tuning, understand the shim direction, and make sure everything is seated and secured properly.

And don't get so caught up in getting a perfect paper tear that you forget about how the bow actually shoots. You've still got to look at the complete system.

Related Articles

If you want to see how the new PSE tuning system fits into each bow's overall performance, these are the next articles I'd recommend.