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Thanks for the suggestions Mental, the bucket it quite deep and the illustration I saw for re-centering the paper doughnut shows the mirror removed. I am not confidant that I could place the new triangle accurately by reaching in. I was wondering if anybody was in the same position and had done it. When I exchange the existing collimation screws with Bobs Knobs I will see what my problem was with the stiff collimation screw, Theo
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