ORIGINAL: muzzyman88
Are you using a string loop as well? You can keep the peep aligned by using one...usually.
Whenever someone states that the peep is rotating, it is usually caused by a couple of things. One, the string isn't very good to begin with. A good set of strings will not have peep rotation issues. Some manufacturers use very good strings on their bows, others use very bad strings. I won't mention names. Another reason a peep will rotate is if the string is very old.
Generally peep rotation issues are caused by the string creeping or stretching over time. You can have it set perfectly one day and the next, it will be completely off. A high quality string will not have these issues.
That is part of it.... but just having a high quality string doesn't cut it.
You have probably heard the buzz term 'train your peep' thrown around several times on here. And once it is trained (much like a dog) it is pretty much impossible to untrain it.
Take a look at your string right where you nock your arrow. You will notice that the sides of your serving are flat..... which is caused by the nock clamping on to the string. When you get a new string.... if your peep is set right and coming back flush to your eye.... you need to MAKE DAMN SURE that you are nocking your arrow square to your string and not twisting it to set it on your rest. Think about how the arrow comes off the string and how it is set at full draw..... square to the string laid in the rest.... thats how you need to nock your arrow as well.
Whisker biscuit users are usually the worst offenders of this because for some reason they want to nock the arrow at 90 degrees and rotate the arrow into the quick shot window...after about 50 shots, those flat spots are set and they are there for good unless you cut off your center serving and start over. You might get lucky and be able to twist your string so that the flat spot and your peep will come back square.... but twisting your string too much will start messing with your tune and your specs and can really cause more harm than good unless done in relative moderation and with a knowledge of what you are doing. Even using the string loop once it is going sideways on your will only work for a shot or two before you have to crank it around again.... and that is because of those flat spots on your serving. Just need to get them working for you... not againest you.