Anyone have any tips on how to lock the flywheel on a vanguard electric start engine, please? Need to remove the flywheel to replace the alternator but have tried to lock the flywheel to allow me to undo the retaining nut and failed miserably. Can't seem to lock it enough to undo the nut using standard sockets, think I'm reasonably competent but failed dismally on what I thought would be a simple task!! Help!!!