I am trying to restore this Dietz US Brass LW Tubular lantern.
The filler cap is badly stuck.
I have dug out the old gasket, and soaked with penetrating oil from both the inside and outside over a period of many days. I have also tried gentle heat-and-quench; I do not want to get it hot enough to melt the solder.
I think the tube the filler cap goes into is steel, while the cap itself is brass. There is probably rust in there. Does anyone have any good ideas for getting it out? I am considering soaking it in a citric acid solution for a few days to see whether that will loosen it up, but I am not holding out a lot of hope. Does anyone have a better idea?
Thanks!
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