http://www3.towerhobbies.com/cgi-bin...?&I=LXAHK6&P=7
I have not seen one without the splined/rifled shaft. I made a starter for my JG100 using the electrifly motor in combination with the bendix and compressor nut from a Wren 54.
Wren USA could also be a source to try for the motor.
regards
Lars