It's part of the brush holder. Easy to remove and replace. Unsnap the retainer clip, remove the two screws, tip the assembly out and replace with new part. Fairly easy DYI project. Whoops, don't forget to unplug the electrical connector. Be gentle, they get brittle with age.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.