These brass tuners are off of a mid to later 19th century seven-string banjo. It appears that they have not functioned for many years and are so corroded that they've turned black and are 'frozen' and won't budge. So far I've soaked them in penetrating oil for a few days to no avail.
I'm looking for ideas to free these up for re-use, since it's an original and rare banjo-guitar.
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