Benjamin 392/397 "2 Spring" Valve Mod for Easier Pumping
It really works! I'll leave it pumped up overnight to check for slow leaks, but I think it's good to go. CORRECTION: I said that you don't necessarily need a hole in the washer, but on second thought, I think that you do, to allow air to flow through the valve. Possum Living valve mod video: • Benjamin 392 Valve Mod

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