I've searched here, and googled extensively, but no joy....
I'm at the stage where I'm about to fit the swivels back on. I had to remove the old collets, so vertical adjustment will be needed. My googling has shown some Heath Robinson options and I might try a 'workaround' based on these. I'm confident that I'll get it "into the ballpark", but I don't really want to get into a protracted series of tinkering and adjustments, so ideally I'd like to get the proper dimensions and see if I could get something made up locally.
The web has thrown up nothing. Forum posters saying they'd measure and post and then nothing. There was a hopeful looking attachment on the rr.net site, but it can't be found. It's like looking for the 'poo' from the offspring of a unicorn and a rocking horse....
As we probably all know, the proper tool is about £1k..!
I think I did ask this earlier, but buried in a rebuild thread, so I thought I'd try once more and ask more specifically.
(off out to the garage shortly to see how confident I am in the results of my workaround option)