anyone have an old, broken 200 GS shifter? I need just the bottom center screw as shown on pic (not the clamp bolt). Trying to help a homeless friendly person on my commute. She can't afford a new shifter. It works fine when I put the screw in from the other side, just missing the screw. The screw is I think 4mm and very short...maybe 4-5 mm with a very wide head