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Edge finders and center-finders, also known as, wigglers, or wobblers, are positioning tools made of cylindrical parts held by springs. Edge finders are designed to accurately determine the location of the edges in relation to the spindle to set up the press or mill. Center finders on the other hand are typically used to pick up cross lines for exact placement of bores. Both edge finders and center finders can be used to locate the center of a hole.

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