Restoring spark
Moderators: John@sos, charlesp, Charles uk, RickUK, Petergalileo
You could do the drill trick by removing the drive tube and exhaust tube, then your 1/2", 13mm drill chuck will easily fit on the bottom of the crankshaft. It usually takes me less time to unbolt the lower end and do this than to look for an adaptor. If you want the flywheel to turn the normal direction, run the drill in reverse. Direction probably doesn't matter as all you're doing is demagnetizing the coil laminations. Of course, this is most convenient when the powerhead is already separated from the lower end.