I fill my headspace with a complex mixture of 78.08% N2, 20.95% O2, 0.93% Ar, 0.03% CO2, and 0.002% Ne Plus lesser amounts of Methane, Helium, Krypton, Hydrogen, Xenon.
I like the idea of adding glass marbles or SS ball bearings, although I don't have either one handy.
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