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Old 12-18-2006, 05:55 PM
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I did some research....

It's a "Mica Undercutter" designed specifically to undercut the mica insulation slots of a commutator of an electric motor.

When you open an electric motor or starter .... the area where the "brushes" ride on... it goes around the shaft and has grooves about an 1/8" or so deep all the way around it.... this tool cut those grooves. Commonly used for regrooving the armatures when rebuilding electric motors.
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