Good luck Allan, and if you draw a blank (I doubt it, but......) let me know. I have had the same thing made. Some of my early home made C/W's were with the 31mm Losmandy hole, and then I went to a Tak, which is also 19mm. I got mine spun from a piece of white polyethelyne, or similar. I may be getting another few done, so if you haven't sorted yours soon, let me know.
Gary
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