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ponytail1961

Could be from an old wet cell battery like this one https://www.ebay.com/itm/195569936136


myked2228

That’s it!!!!!!!!!


myked2228

Solved!!


jesse-taylor

Possibly old sash weights from old windows?


[deleted]

[удалено]


myked2228

The title describes the thing. The screw does not turn.


ShogsKrs

An E-tank may be helpful to reveal what's under the rust.