does anyone know how to remove the lock at bottom of steering stem? I'm replacing triple clamp and lock on old triple clamp doesn't work and I don't have a key for lock on replacement triple clamp. there is an outer cap at bottom that comes off by removing small screw, hoping lock barrel would then just fall out but does not. also, do these things just stop functioning after a while? seems like opening in top would allow for a lot of moisture and dirt to get inside.