Last year I took apart my Pacemaker's focal plane shutter thinking I could improve it. I thought the shutter wasn't firing at the proper speeds. Predictably, given my lack of skill or misunderstanding instructions, I gave up halfway. All the parts are there -- I more or less put it back together -- but I'm not going to be able to fix it and the FPS does not work. I don't really use it any more but I feel bad for wrecking its function. Everything else works, just not the rear shutter. Before I wrecked it I wanted to explore barrel lenses. I don't care so much now but whoever wants to use it after me might. Is this an easy fix for a professional? Should I bother throwing money into a repair? I was thinking of just selling it as is if it sounded like the repair was too much.