Still working away on cleaning and polishing the brass.
I tried the full strength ammonia soak and it worked well, followed by Brasso.
But to really finish it off, after the ammonia bath, I got out the sandpaper--400 followed by 800.
I wouldn't normally sand metal, but since the original brass was sand-blasted, this seems to work best.
Haven't gotten around to trying the lacquer thinner yet, but I have several parts--especially knurled knobs that won't succumb to sandpaper--remaining to be cleaned and polished.
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