RE: Marquis string suppressor ?
Glue it in with Superglue. And have your local Bowtech/Diamond dealer get you a half-dozen or so spares.
Make sure your string is properly centered on the string, and that you've got a slight gap between the string and the ShortStop ("slight" = I used a business card as the thickness gauge.)
It should last for at least 300 shots before requiring replacement.