tried the shims today, started with one, then tried two, but the slipper still isn't tightening to allow any drive at all. Took the gearbox apart again and checked all the gears, no wear and all the shims etc are in the correct place and the condition of the layshaft spacer is perfect, showing no wear at either end. I also checked my gear diff and it is built fine with 1000wt oil. The slipper pads are only slightly glazed - but the car has one ran for 2-3 heats, so I would have thought the pads would still be fine. I replaced the slipper nut for a new one, and ensured that I have a small washer at each end of the slipper spring before tightening up the splitter nut. I have also tried another motor which I know works fine in my 410, so I have ruled out any problem relating to the motor.
at this point, Im really struggling to find a solution, all gears are perfect and the slipper pads fit into the spur gear and the plates appear to be pressing against the pads, so I can't see how they would move when applying power.
Having owned a 210 in the past, I've never had any problems previously with a 2WD slipper and gearbox, really now at the point of giving up.
Can't think of anything else to try??
Raymond.