after losing many lock screws on my penns, I went to the hardware store, bought some stainless screws with the right shoulder diameter and a matching tap. I also turned down some stainless for crossbars on my old penns, and then tapped the ends for a standard sized stainless screw, no more broken screws or corroded crossbars. Tapping the handle is pretty easy, if you cant find the right diameter head just chuck it up in a drill and hit it with a file.