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I used an erasable pen eraser at first just to do the initial install to get the junk off the slip rings and brushes in and no load tested to make sure there were no other surprises then found a commutator stick on ebay which has a consistency some where between that of soap stone and lime stone, with a bit of chalkyness to it. I thought a "commutator stick" would be softer. I could sharpen a knife on it.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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