Overtightned the rear derailleur cable clamp. It is now blocked I have over-tightened the bolt on the rear derailleur clamp (Shimano tourney). There is no resistance on the bolt, when tightening it or untightening but the clamp does not move anymore. I don't want to force something the wrong way anymore. How can it be unblocked now?
I would back off the bolt in a manner similar to your second image. With a small screw driver pry the clamp away from the derailleur toward the head of the bolt. When the clamp is free, you will notice a small &quot;nub&quot; protruding from the derailleur. The purpose of this nub is to prevent the clamp from rotating when it is tightened. My guess is your clamp is on the &quot;nub&quot;. This is preventing the clamp from seating against the derailleur and holding the cable in position.