Well, having been inspired by others I've lashed out and bought a fine focus control for my Mak. It works a treat, and is worth every cent. I got the idea especially from AndrewJ, and while not up to the standard of Mental's steampunk effort, nor with the aussie flavour of Merlin's, it'll do me.
The good thing is, it slips on and off very easily, while the metal grips the rubber knob really well. I think I'll rig up a lassoo to attach it to the mount so I don't lose it in the dark.
It stops nearly all the shaking, and image shift is much less of an issue
Cheers
Stephen