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Drift Alignment by Robert Vice. It's a nifty technique you use to polar align. Basically you take a one-minute exposure and, using the slowest speed setting, slew for 30 seconds in one direction and 30 seconds in the other direction. If you're perfectly aligned you see a perfectly straight line as a result; if you're out you'll see a V shape.
It's slightly more complicated than that; if you're keen, PM me and I'll walk you through it. Took a few false starts and a lot of questions, but I think I've got it down pat now (touch wood).
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