Reproduction motor cap for Featherweight 221. This is the motor cap screw that measures 3/8" across the bottom*. It covers the carbon brush inside the motor. There are two motor caps on your Featherweight motor because there are two carbon brushes - one is seen clearly on the top of the motor, but the other is hidden on the underside. You can access the bottom motor cap by inserting a screwdriver into the allotted hole on the bottom of the machine or by removing the motor altogether.
* If your motor cap is larger and measures 1/2" across the bottom (more common to White 221K and 222K Free-Arm Featherweight motors), there is no replica part available.
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