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Use a draw tube to center your secondary, not a cheshire. It's to align the primary. Then you use an auto collimator or laser to tilt the secondary, then realign the primary with the cheshire and iterate until you get closer.
Use two discs cut out of a plastic milk container and place them between the secondary collimation screws and the secondary holder. This way it won't bite into the holder and will also be easier to tweak.
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