Thanks for the kind comments.
I have hit a bit of a problem with the drive shaft - when I disengage the cone clutch, it periodically "bites" - ie it can sit there and be disengaged, but then randomly engage. I also notice that the black plastic "guide" gets very hot - the fork is backed off so there is a bit of slack, so that doesn't appear to be the problem. The other thing I notice is that when it "bites" and engages although being in the disengaged position, the drive shaft vibrates.
My hypothesis is that the clutch body end of the drive shaft is potentially not sitting in the clutch body bearing - does this sound reasonable, or do people have other experiences with this problem?
If that is the issue, is the solution as simple as backing off the grub screws on the engine shaft and pushing it across so it is on the shaft properly?
Cheers
