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I believe that the Tak scope is very good for getting you close to collimation. However I use Als collimation Aid which gets me spot on for collimation with round stars across the frame. I take a one second image of a bright defocused star and use als aid over the top of the defocused star to see if all circles are concentric. If not I adjust the secondary pivots as needed until they are absolutely spot on. Near enough is NOT good enough. I use the same system with my SCT and it works perfectly.
See NGC253 that I shot with the 10"GSO RC and collimation done this way was last touched ~6 months ago.
Allan
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