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I went for a walk and found when they were doing one of the hard waste collections and scored some old speaker magnets, to protect the tube I filed them smooth and then hot glued felt to them so as not to scratch the tube.
You may also find you get some flexure in the mount box, which can cause some odd movements at the eyepiece. I solved this with a couple of el cheapo clamps out of a hardware store sales bin. Worked a treat.
Good luck.
Darren
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