So I bought one of these motors:
http://www.amainhobbies.com/product_...ess-Motor-105T thinking that if the shaft flat was too short I would use a dremel to lengthen it.
But the flat is as far back as it can go and the top of the motor has that hump where the bearing sits.
It only allows for the pinion to cover about 1/3 of the spur...and if I flip the pinion the set screw hits the belt...
Any suggestions?