Hello. My hot water shower knob has been stuck for months and the only way I can turn it is buy using channel locks. Though I don't think this has anything to do with it, the knobs themselves used to fall off all the time, and so during a weak moment I epoxied them into place. I know, not a smart move. :o I'm hoping the channel locks will work indefinitely because a fix would involve cutting into the wall from the opposite side, because it is a plastic shower stall. I'd appreciate any thoughts on this from a qualified person. Thank you.