Interesting. To quote Johnny Carson, "I did not know that."

I flushed/swabbed the commutator pretty thoroughly with CRC electric contact cleaner after smoothing it out, but I wouldn't doubt that a little abrasive residue got left behind. Hope the effect turns out to be minimal.

I'll lay off the wet/dry stuff when I rebuild the blower motor in my coupe, though. Thanks!

Russ M
'82 300td
'82 300cd