rotorhead0207

Goldrust1 had or still has the HL2215-450 in stock. email him and ask. They were quite cheap if I remember correctly. They have the correct shaft size to use the rex pinions. If you count the teeth on your stock pinion you'll discover that the manual is wrong it's not 12 tooth it's 14 tooth so an 11 or 12 tooth for a rex should put you right on stock speed. As for the bells I don't know of a single source for after market bells. It'd be nice to find one and what is probably needed is a motor that has the bearing on the free (open) end of the bell to support it. That would make them almost bullet proof. It's not so much the fast speed they turn it's that the open end of the bell has no support and it just rocks around when they take a hit. This puts all the stress on the 5 arms on the shaft end of the bell. It's interesting that the cracks propagate from the set screw hole. Maybe it just needs some red Locktite on the shaft then tighten the screw then back it off till the Locktite sets than insert the set screw and tighten it down. That way the Locktite has to shear before the set screw is hit, putting the load on the end bell.