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Interesting- I assume you'll always have to fine tune the alignment after each setup? I'd be very interested if anyone ever gets their mount routinely into an alignment good enough for imaging this way?
My 'trick' was to stop during disassembly and take a very careful measurement of the apparent magnetic bearing by holding a compass against a repeatable spot on the tripod. This accounts for the local magnetic distortion caused by the steel in the tripod - which in my case is mostly aluminium anyway. Then when I set the thing up I align the tripod and I'm usually well within a degree. I did 'hole it in one" once!
Caveat is that I'm a geologist, so the compass is actually my trusty old Brunton, which is a bit better than the compass we used to get with our school shoes back in the '70s..
Cheers
Andrew.
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