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when working with such jigs, make sure you dont use sharp tipped worm screws, they will leave nasty imprints on the crankwebs ! Have u thought about making a key to hold on the flywheel ? it would be a compromiss. i used set screws on my Mill engine and the crankshaft is now torn up beacuse it did slip a couple of times when we live steamed it, especialy when the engine accidently starts to quick, the momentum just takes over and spins the wheel free, unless u have a small countersunk hole for the set screw. how true does the crankshaft run ? did everything go well ?