My neighbor at my warehouse/shop space is a metal fabricator and machinist. He thinks I'm OK with the solder and he puts the consensus over the top. I've gone to some lengths to save $500 here. I prepared a little jig to place the armature in and spin it with compressed air. Has bearings attached on both ends so it was easy. I started with 320 wet or dry paper on the commutator and and went up to 1000. Looks and feels pretty smooth. Photos before the buffing - what was I thinking.

The two loose copper bits in the photo are the connectors power hooks up to. I need to pry up the tabs and stick the new brush wire in, this with the new springs in betwixt. Here goes . . .

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1986 300SDL, 362K
1984 300D, 138K