Due to the silver staining of the wires after use, I was about to write a fiery review of how I ruined my $600 aluminum cylinder head by saving $20 on a brass plated spoked aluminum wheel. . But to make sure I didn't shoot an innocent person, I put the bristles under a microscope. Turns out you shouldn't go with an angle grinder and brass wire wheel with an expensive precision finish. If you choose to do so, then at least pause from time to time, and not just wait for "the job is done," to understand what a grave mistake you've made. So my guess is that the bristles just get stained with use. . In case anyone is wondering, I deviated the head from alignment by about 0.004 inch in about 3 minutes of "cleaning". If you're thinking of using this to clean seals, no. Stop. Buy a carbide scraper, a plastic scraper, and brakleen. and use the least aggressive remedy that works. a piece of padding that won't scrape. He really cares about the rough, microscopic bumpy, high RA finish that the spoked wheel leaves behind. It's funny how I examine things after I destroy them.
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