the only time i've had one come loose was because in a gear changing hurry i mounted it on the round instead of the flat spot..get some blue loc-tite gel..it's awesome...it comes in a twist up tube like chapstick

http://www.autozone.com/autozone/acc..._&target=shelf

this looks different than what I bought but the same idea, it's not in a toothpaste tube it's more like chapstick