not sure I understand "repolarize the flywheel magnet "
It is a permanent magnet? all the B&S flywheels of that era are/were magnets placed in the flywheel - so you aint gonna fix that ! I too think .10 is a weee bit big!!! When I set the coil, I would take a dollar bill and fold it once and slide it in,rotate and put bill back in pocket! I suggest you do that too.