Quote:
Originally Posted by multiweb
You sticky tape a couple of A4 sheets together so you can make a ring around your tube (tight fit). Then you mark the center of the hole where you're going to fit your focuser in. Then remove the paper, fold it over the dot you did and on the other fold you make another dot. Then place the paper ring over your tube again and center the first dot into your focuser hole again. The second dot marks the intersection of the tube and the focuser axis. Drill a small hole in the tube so you can see it.
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I did that trick to get the spots to drill the 4 holes for the spider and 3 holes for the mirror cell , and to check I'd cut my tube ends square and straight (needed some tweeking ... a job for the Dremel and its cutting disk).