Av8tor, very nice. Your picture gave me some good ideas. Where can you get the little magnet that goes on the hub? Is there a "minimum diameter" for the hub where the magnet mounts?

Another (unrelated)question. If Iwere to remove the exhaust bridge, Iwould need to "pin the piston" to prevent the ring from rotating. How easy is this to do? Ican get a ring from Frank Bowman but he says he does not have the time to pin the piston. Isuppose Icould attempt to grind a notch inthe existing ring (Is this advisable?). What tools are needed to replace the piston ring?</p>