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I had read this in reviews on the internet too. That is why I found collimation so confusing at first, I thought how in the hell do you adjust those three screws on the secondary in pitch blackness? It is only recently that I found a review that said the secondary is done pretty much once a year and the primary is adjusted each time you use it. This makes a lot more sense to me.
P.S. I have a chesire/sighttube and I find it is all I need. I have read too many reports on the laser collimators being inaccurate I have not wasted my time on them.
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