I've had to tighten my chanring bolts every once in a while because I notice that my drivetrain sort of "clicks" oddly when I put back pressure or start from a stop. Tightening the chainring bolts seemed to fix this for a few months, but I find it rather hard to do... They already seem kind of tight, and every time I try to tigthen them more, my chainring bolt nut tool thing just slips out of the rear of the bolt. Any tips on getting it to to stay, or could my problem be due to something else now?