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Excellent question! Yes and no. Yes cutting the pieces out can affect the accuracy of the finished assembly and then the compounded inaccuracies can affect the clock movement. Is there one way better than another? I'll say no, because it's still paper, however my clock needed adjustment cuts but only to the escapement wheel. I think that the consistency is more important than under the line, over the line, or on the line. And in that case I'd say you can always take more off than put more on.
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