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Dennis,
I was a bit like you in that i wasn't sure if everything was collimated or not. i use an orion cheshire collimator very similar to your homemade one and after a bit of trial and error have learned to trust it. The star test is simply, when you look at a star or planet adjust it out of focus and the blurry image should be a perfect circle then focus it back to a clear image. If the blurry star is oblong or in my case a semi circle, then something is a miss.
Cheers
Scott
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