Dad brought his K22 shooting this weekend, only to discover it didn't work. Couldn't cock the hammer,single or double action. After a bit of investigation, it seems that the bolt in the bottom of the cylinder window which locks the cylinder in place is out of time. It drops down when you start to cock the hammer, but pops back up too soon which prevents the cylinder from turning. Any ideas on what needs fixed? I'm gonna call the local smith tomorrow and see what he says. He's a good guy and I don't think he would take a job over his head, but... Is this one that's better off sent back to S&W for repair?