extreme1, Yes you have to press your bow to install. It is worth it if it does not stretch and wear out. If you shoot with one knot on each side of the string sometimes a knot will touch your face due to anchor point. Shoot alot and that spot gets sore quick. I have had trouble with regular D loops slipping. I tie them with small diameter serving. I haven't tried any of these yet. Don't want to mess with my hunting setup until season is over next week.