I serve it in with one continuous string instead of two and then mark where my string contacts my peep with a red marker to know in a glance if my peep has moved.
Yeah when I had my last peep i had them tie mine into place. Didn't even want to chance it moving around.
Since my bow is not as technologically advanced as most of yins, it has a tear drop string system so my local shop ordered me one. It was back ordered but got it an it hasn't caused a problem yet.