Somewhere around here I have a home-made borescope for my old Jaegers equatorial, it works on the same principle as the Tuthill scope and I made it for about two dollars. I must agree with Patrick, a borescope is the fastest way to achieve precise polar alignment, but a true borescope does require that you can either remove your polar shaft (as in my Jaegers mount), or have a hollow polar shaft and on many modern designs. I think the Tuthil scope just used V-grooves for German equatorials, and mounted on the shaft housing, not sure how it worked on fork-mounted SCT's... Patrick wrote:
There is one other option that I've had good luck with, namely a nifty device called a Tuthill Precision Polar Alignment Scope.
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