[lincpimp]

Oh yeah, spur will be 303 stainless, 50t mod 1.5 from sdp-si. It does have a setscrew, and should wear ok against the rcm pinions. Depending on how I mount the motor I may not be able to go any smaller with the spur, as the large motor, plus about 20-25mm for the motor clamps thickness and the platform will cause issues with contact with the center drive outdrive cups.

Hmm, need to do some more match and see if this will work...