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Sorry gentlemen, for the delay. I was thinking about it.
Fundamentally the issue is both a philosophical one and the desire to meet a challenge.
Philosophically, I like to be able to continuously see the effect of any adjustment. As it is, when I am using Cheshire or Autocollimator, I need to tweak and return to eyepiece, tweak and return to eyepiece. I just don't like it. And after I worked out a likely solution, then I had this challenge in front of me to meet. OK, it's just me.
Now, my scope has usually held collimation well, between dismantling and rebuild. Just a tweak needed. But a few times it has been more than a tweak and I haven't been able to see why? I've rechecked the poles and UTA are seated correctly, and they always are. Seems the bouncing to the site had caused some movement in the secondary mirror. Now, as you will have seen elsewhere, I have had the recent scare of the scope falling over in high wind during that day. All has seemed fine since then, but I had to completely recollimate from almost scratch. I have only rebuilt the scope once since then and all was fine.
With the autocollimator, I am trying to learn how to use the "Carefully Decollimated Primary" protocol, but I find that, without a simultaneous view of what happens in the autocollimator when I adjust the primary collimation bolts, I just get lost with the reflections. So, in well known Eric style, I'll create a sledgehammer to get at this peanut!
So I don't have a logical response, sorry.
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