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Peter Tan in HK can make you a variable spacer, cost me about $50, basically 2x 2" spacers that screw inside each other and a lock nut to make sure it doesnt move. I can infinately vary it across a 12mm spacing distance.
He will make it suit whatever prime spacing you need ie My QHY10 had the CCD approx 20mm from glass, so I had made a 29-41mm spacer.
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