I have managed to install the RA motor. Yes it works....so happy! The only problem after a while was the motor stalling. In the cold lght of the day the problem has been traced back to the clutch plate moving a few mm as the gear turns, enough to rub on the M5 bolts on the 360 gear aluminium plates. The solution is to take a few mm all tound off the clutch plate or countersink the M5 bolts or both.
Dec next.
A few photos.
1 The black line around the clutch plate shows the tiny bit of movement...small but enough to foul the works.
2 Motor and Driver
3 From the front after 30mins of tracking
Alex please note the black counterweights
Edit: The clutch plate moves less than a single mm. The guide pin holes is where the movement comes from, an easy fix.