I’ve been using a SOLO MTN Butane Gas Refill Canister Filling Adapter but it started leaking. They don’t sell them anymore.
There’s a shaft with a needle valve on it. Two o-rings to keep the butane from leaking
There’s a threaded bushing that keeps the shaft in place. There is too much clearance between the shaft and the bushing so the shaft rocks. This causes butane to leak out past the o-rings.
I just opened the needle valve and siliconed the outside – doesn’t leak now but you can’t close the needle valve.

The other end screws onto a canister and also has a needle valve, so I just close it.
There’s probably a better solution which some more mechanically inclined person might have : )



