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Finished this a while ago, but lockdown finally got me to post about it.
Decided I wanted some front and rear sights for a single shot rifle but didn’t have enough time to do it in the workshop, so...

Cell phone chargers work well - low voltage low amperage kinds. Probably will rub someone the wrong way saying that, but does work.

Also nice because it won't get too aggressive and start eroding...

On the topic of derusting delicate/historically valuable stuff, have found Evaporust to be excellent for derusting delicate or complicated items:...