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Thanks, mnmarcus! I was thinking you'd have to be exactly 180 for that to work, but I tried it on paper with a compass and it does work well, even if you're not anywhere close to 180. I don't think string would work, though. It would let the pencil angle in or out too much, destroying any hope for accuracy. Rigidly fastening (taping?) the pencil to a stick might work.
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-Terry
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