Buy a bottle of transmission 'stop leak' additive or transmission fluid.
Place one drop of fluid on the rubber seal that the Co2 cartridge will seal against.
Let that sit for a few hours.
This will soften the seal.
About every 8 Co2 cartridges used place a drop of fluid on the top of the cartridge and install.
That should keep the seal working as designed.
Place one drop of fluid on the rubber seal that the Co2 cartridge will seal against.
Let that sit for a few hours.
This will soften the seal.
About every 8 Co2 cartridges used place a drop of fluid on the top of the cartridge and install.
That should keep the seal working as designed.