I have used an eraser on the end of a pencil to clean the commutator of oxidation. (either running or not) This method usually looks as clean as if you used emery cloth but does not leave any scratches like emery cloth will.
Look through this thread(1 of 4 I found using the search function); http://steelsoldiers.com/index.php?name=PNphpBB2&file=viewtopic&t=4498
I used the search at the top of this page and typed in "transistor regulator" then i selected the choice for "search for all items" this search gave me 4...
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!