Joined: Jul 2015
Posts: 7,381
Likes: 3,222
From: NW Oregon
Bikes: 1982 Trek 930R Custom, '91 Diamondback Ascent w/ XT, XTR updates, Fuji Team Pro CF road flyer, Specialized Sirrus Gravel Convert, '09 Comencal Meta 5.5 XC, '02 Marin MBX500, '84 Gitane Criterium bike
ok... if the Clamp Nut is stripped out, then the bolt will spin endlessly... if the clamp is too large, a spacer may have fallen out of the derailleur clamp bands....
either of those problems can be easily solved.
a third scenario is the clamp was over-tightened until it broke.
which condition are you seeing?