You who have been following me through the vicissitudes of this adventure will remember the SethThomas mechanical/electric, ST 124E, whose motor gave out on me and I had to hunt for a replacement. Finally found a replacement, installed it in the movement, and (after testing), put it in the case, attached the hands and hoped. It seemed to run OK, but once in a while it would skip a chime. Took mvt back out hooked it up and before long the once-in-a-while turned into all-the time. By keen observation, I discovered that the three short lobes on the center cam weren't raising the lever enough to lift the chime locking piece out of the notch far enough to unlock the train. They barely budge it. Hasn't always been this way. Used to run just fine. Something has happened over time to make it do this. AND I CAN'T THINK OF WHAT! So I'm calling on y'all who are smarter than me to get into the discussion. Possible cause #1: the center cam wore down so it can't lift the lever enough. Possible cause #2: the end of the lifting lever wore down so the cam cain't lift it enough. Neither of those seems plausible. An obvious sledgehammer remedy would be to solder a piece of brass to the end of the lever, to increase the lift. But before I go modifying parts, I thought I'd seek your opinions and advice. What do y'all thing think might have caused it? And what do y'all think the proper cure would be? Ideas, please.