I think they are adjustable and it would not be out of the realm of possibility that something is loose. I personally would not hesitate to look inside myself. If it resists, my trick is to take a large sheet metal screw, like a #12 and hand screw it into the driver mounting hole and give it a yank. It does not go into the mounting hole in the cabinet very far so it is left intact and gives you leverage. Trying to pry it out will surely damage the veneer.