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Thanks Eric and Josh!
OK, Enough about the idea of a flat helping anything.
As far as the laser, I don't think aiming at a centered dot on a paper mask is going to get me very accurately centered but I suppose it is better than nothing. The Glatter laser I have projects concentric circles but these circles do not reach the edge of the objective over the path length. Now, if they could somehow be spread out more they might prove useful in centering.
1. I will take the rotator to my local machine shop. I'm hopeful the tech there will help me measure the runout as Josh suggests. If not I'll need to wait until the tool I've ordered arrives.
2. I will post a photo of the setup.
Peter
Last edited by PRejto; 26-07-2018 at 10:32 AM.
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