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Registered
Join Date: Jun 2006
Location: Ballston Spa, NY
Posts: 528
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More about how straight it is vs how long. 2ft can work. I use a 3' machinist parallel that's probably older than I am(drilled and ground cast iron). A wide flat surface makes it more stable, thus any decent straight level from a hardware store can work as well if the length is required.
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Adam Hennessy
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