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i was going to say I don't think so as how do you spot the mirror but you never know. but then you can align the optical train with it? Also having seen a howie glatter grid collimator it was very quick to to do - one thing to watch is the tube warps with weight - so that will warp your collimation. i know wth Alan's we put some extra bracing on the focuser mountings to help stop that. but i am no expert and talking through my hat on a raining Easter night
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