My 52-3100 can be hand cranked I built a end that fits the front of the harmonic balancer out of a 1/2 inch socket than I put a 12 inch extention and a rachet on it I use it when I adjust the points or the valves makes it easy to turn the engine over so I can get it right where I need to also now in the winter I'll turn the engine over 1/2 a turn once every couple of weeks.
Pete
