Hello again all, I've just remembered! and I have a follow up question please? The last one I tried with the "fault" on the ALT axis. The problem I had was that the motion on this axis was incredibly stiff - very difficult to move by hand, using pressure on the dovetail. I remember thinking that it may just need a bit of movement to free it up. As I began this, rotating it only one way, I can't remember whether it was clockwise or the other, the entire ALT unit began to back out so that I could see the ball bearings in the mechanism. Did I do something daft and only turn it the one way and this should be expected? or was this a genuine fault with the one I had? Sorry to bang on about this but I am really keen to try one out again!
Many thanks, Mark