I have a small bottle of whale oil, usually used in clock works and watches. It's prized for its lack of evaporation over long periods of time. Check to see if its viscosity is correct before using on a Luger, just to make sure, but I'd think it would work great!
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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