I have been using my flex shaft for carving into crystals for the past few days. I've been able to change the bits, but yesterday the collet started feeling like it was sticking and today, I can't even unscrew it to change the bit. Every time I press the unlock button and use the wrench to turn the nut, it feels like its going to turn and unlock but then it feels like it moves and skips and then is rotating with the lock still in place. What can I do to get it to unlock? Thank
