I found a source for brushes to
fit the 3 3/8" diameter mower motors but they need to be fitted. The
brushes are 7/8" long and have to be cut down to 5/8" to fit in the motor.
I cut them with a hacksaw then filed them flat and square. The wire has to
be cut to lenght the soldered to the carrage bolt head. You can't buy them
already attached to the bolts. Take the bolts out of the end cap before
soldering so you don't melt the insulator. The source is: www.americanelectricmotor.com
Ask for brush #57. They are about $3.60 each plus shipping.
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