Did you try blasting it with 30+ lbs of pressure to get it to seal then bleed the pressure down to serving pressure? I have a few kegs that even with lube they will leak around the lid until I pump the psi to 30 for a a few seconds then i can lower the pressure and they won't leak.
Sometime I will replace the big O rings and see if that fixes it altogether.
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TEN GALLON ALES
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