Thanks guys. Defintely neutral balance then [sm=thumbup.gif]

Jim, I never thought of the reversing-the-cone thing, doh! I have a little finger balancer for my props (two cones slide on a short metal shaft; shaft has pointed ends to hold between finger & thumb) so I reversed one cone and it works, sort of. My flywheel is balanced heavy toward the non-magnet side, but if I mark this point and then fit it onto the key-way on the motor shaft it doesn't correspond to TDC or BDC which I would have thought were the two places where counter-active mass would've been necessary (but then, what would I know ). Just an observation...