With the drive section all good and the sole plate issue conquered, there was one more issue with the mechanical side. The drive clutch that runs the rear roller self drive was engaging, but not disengaging. While i had the chains off I had pulled apart the large intermediate sprocket to see if the cork was sticky, it wasn't and was actually in really good condition. In the centre is the clutch operating bolt that squeezes the sprocket on to the cork. If that bolt is too tight, the clutch stays on the whole time. It wasn't too tight.
