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There is always a groove on the upper surface of the short cross of a chase, at each end, six or seven inches long. Their use is to receive the spur, when working with points, and to allow it to make a hole in the paper, without injury to itself. The grooves in wrought iron chases are of a good form, being cut with a tool tapering to the bottom like a wedge, which enables the spur to make a clean hole in the paper; those in cast iron chases are generally flat at the bottom and too wide, which causes the holes to gull. See Gull.

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