[troypiggo (Troy)]

I have the Cat's Eye kit and after some tweaking to my secondary holder, I can now quite easily get everything lined up with the hot dots and the reflections in the autocollimator.

1. With the autocollimator, looking through the centre hole and the hot dots are perfectly aligned, then look through the offset hole each pair may not be perfectly aligned. If I get them perfectly aligned in the offset hole, they're not in the centre hole. Wondering if this is normal, or if it could be because the hotdot may not be perfectly in the optical centre? If so, should I just average the difference?

2. I understand that ultimately a star test is the final step in the process. Given that the final step in the collimation iterations with the Cat's Eye kit seems to always be tweaking the secondary, is it the primary or secondary that you tweak with the star test? The primary would be easier and more forgiving, but the final adjustments to the secondary seem to minute that I was thinking that's the critical element?