Check this web site out for (possibly) the answer to your question.
Someone in this group suggested this a few years back, if my old memory is
Saw something similar some years ago in one of the model mags, but
nearly as elegantly done as this. SFFR (saved for future reference.)
Re: Blackening wheels
Most come blackened these days, so that's not a problem. I've used
gun-bluing successfully on just about every metal surface. Gives colours
from dark brown through bluish-grey to black depending on alloy. It's
essential to clean the surface with a degreasing agent first, though.
Hobby Black (TM) is the same stuff AFAICT, just packaged differently and
priced accordingly. Caution: these materials are toxic.
PS: something wrong with the page's source code, it will print only "1
of 1", about half the total page.
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