I have to agree with Arthur on this one. I might have limited experience as I've only been shooting since 1972. During that time I've shot target archery, field archery, indoor and outdoor target, 3D, hunting---you name it, and have never had a tube attached to a peep. If you have decent strings on your bow you can adjust the peep (us old timers call it "training the string") so the peep rotates to the same position all the time. We call it training the string. It takes a little work and time, but eliminates a tube that is noisy and can break at the wrong time.

And if you look Fletcher now has a peep that I think is called a Super Hunter, with a 1/4" hole. This is a hole that is big enough to let a lot of light through, and doesn't necessarily have to rotate right toward the eye every time to be useful. I have one on my ShadowCat and it works just fine.

If you do more research and use your head you'll probably also notice that most people that have peeps with tubes on them also have very cheap (factory) strings on them that are constantly creeping. Put some decent aftermarket strings on the bow and peep rotation is a thing of the past, as is the bow constantly changing it's tune. Barring that, factory strings can be made better simply by putting a bunch of twists in them. Few come with enough twists in the first place. A string should have approximately 1 complete twist every two inches of it's length. This has an added benefit of making the bow shoot more quiet (less string noise). Ya just twist up the rigging, shoot a hundred shots or so to stabilize the string, and then set your peep for proper rotation.

What the heck, it takes a little time and thought, but playing is fun, not to say anything about how much you can learn from it. Then someday you'll be able to answer such questions instead of asking. Learn by doing. That's how we did it. And good luck.