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Hi Rolf,
So do you have a wooden dowel inside the Al tube and if so how did you secure it to the tube?
as for the guitar tuners, how about routing the hole a few mm each side rather than the swivel? that way you could actually shift the tuner head sideways which is what you'd want to line up the strings, and then tighten it.
Shouldn't move as the forces aren't line line with the groove.
yes, I'd suggest using a laser to check shift in collimation. I was really surprised at the shift when I rotated the scope cause all my joints were secure.
another test is to leave the scope standing vertically on the floor with the laser on, and just gently push the top ring of the OTA and watch if the laser moves on the primary.
after I reinforced mine, I tested with a cats eye AC and was relieved to see absolutely no shift in collimation.
When do you get your mirror and do you have any pics of your mirror cell?
cheers
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