Cheers for the replys everyone.

I'm not too fussed with the camlock. I use a ratchet spanner with angle adjustment on the nut on my tailstock as it is so a camlock isn't important although it'd be nice.

My aim is to be able to drill a hole, possibly ream it, so an accurate size good enough to make V pulleys for O-rings for a small CNC spindle.

My current tailstock wasn't capable of doing such things because it shifted every time you used it, the drills pinged back every time you retracted, it was wobbly on the ways so I could drill a hole, pull the stock back and change the drill, put it back and it'd be in a different position. Before I'd never attempted to do any major accurate work with it so it never bothered me, but now that I do need accuracy, I'm not getting it.

And yes, £80 is a shedload of money!

Rob, perhaps you could price up what you would like for those stocks? maybe I could fettle together a working stock from the parts.