Maybe it's obvious, but have you tried just pointing close to a bright light so you can get real time feedback on the camera? Eyeballing it with a torch may not give the same effect, besides, you'll have your hands free to manipulate things and see if they move (ie, rotating just the camera and seeing if the grub screw rotates with it).
Might help you zero in on a solution faster than using the stars?
Let us know. I'll be interested to hear the solution.
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