First the bad news, SIMON, I removed the RDF to remove the locking screw but it wasn't there, bugger!
The good news is when I replaced it I was able to correctly place the red dot on the horizontal axis and the vertical is only very slightly off. Dean I was thinking of using a washer to solve the vertical but as it's only very slightly off I've decided to leave it as it is as so far it is working fine with a slight compensation for the difference.
Thanks for all your help, now to think of getting that Barlow!
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