Hi, After removing the aftermarket paint and/or oil from my rear wheel nipples, they were still highly stained. Years ago I bought an ammo tumbler to clean all the brass parts and fasteners from old traffic signals that I collect. Anyway, I tumbled the nipples and put them in an ultrasonic to clean the threads and most look a lot more acceptable now. Before going to that trouble I should have asked this question first but is there any reason why I shouldn’t reuse my old nipples in the event I can’t find enough NOS replacement nipples in the relatively near future? Thanks.