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Try the good folks at Orion Optical in the UK , they will make them to spec.
My rings cost me 110UKP about 15 months ago + shipping (mine were for a 316mm OD tube). They work at +/- 1mm for their tolerance. They are very nice , if a tad tightish , but not so much so that I can't get them on or rotate the tube with the bolt (?) thingy loosened a few turns. The self adhesive cloth stuff makes them tight I think.
I added spacers and a dovetail bar and a 10" mirror cell to my order all in one hit.
Last edited by Ian Robinson; 10-11-2008 at 10:55 AM.
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