Be assured the tighter that fit the better your engine is going to be. Never turn an engine over by hand dry In fact don,t turn them over by hand at all when new. Always back up the engine aginst compression before using the starter and use a good quality spinner nut/silicon insert interface. Always use two hands on the starter and a helper to aid in holding the airplane if restraints are not used. Always be carefull to assure that the axis of the starter shaft is in alignment with the engines crankshaft.

John