The other thing to try is remove the bell. You do that by prying apart the cradle so one side of the yoke is clear. Make sure there is a magnet under the bell. Then take a drill bit the size of the pins at the ends of the yoke and open up the openings in the cradle. Replace the bell. Make sure it swings freely and you should be good. If it doesn't swing there is another problem inside the engine.
Pete
