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I'd strongly suggest a Howie Glatter 2 inch collimator with the 1mm aperture stop to give you a nice pinpoint laser to collimate the secondary. The collimators are themselves collimated to several arcseconds accuracy. When you collimate the primary, I'd recommend a Tublug which is an attachment into whcih you insert the collimator that gives a reflection of the mirror centre spot. This makes primary collimation a breeze.
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