I recently changed the engine in my 1950 M and am in the process of reassembling. For some reason, I can't get the governor put back in. The gears won't mesh even though the governor gear is free to rotate and the engine has been spun over to move the gear under the front cover. I've also tried tapping the governor with a hammer to get it to go in but it didn't help. Am I missing something - shouldn't the gears mesh without a problem or is there a special method of installing it? I did have all the gears off under the cover since I had to change out the plate behind them. I had to use the plate from my old engine to get the hydraulic pump to fit as the bolt hole spacing must be different for different year M's. Any help with this issue would be appreciated.