I saw a YouTube video and tried it. After a few attempts, I was able to fill them.
1. Remove the brass valve with a pliers.
2. Remove the check valve by screwing in a drywall screw about 4 turns and then pull it out with a pliers. Throw away.
3. Reinsert the brass fitting and make sure it snaps in.
4. I used Scripto brand butane and sanded the tip diameter down to fit the valve. Worked perfect.
$2.99 for the can. I filled four cartridges and can fill probably three more. If the cartridge stops filling, release some pressure with the screw and it will fill again.
1. Remove the brass valve with a pliers.

2. Remove the check valve by screwing in a drywall screw about 4 turns and then pull it out with a pliers. Throw away.

3. Reinsert the brass fitting and make sure it snaps in.
4. I used Scripto brand butane and sanded the tip diameter down to fit the valve. Worked perfect.

$2.99 for the can. I filled four cartridges and can fill probably three more. If the cartridge stops filling, release some pressure with the screw and it will fill again.
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