CONTINENTAL EDISON BCT-0538A Guide D'utilisation page 22

Replace CO2 metal connector and seal washer
CO2 metal connector and seal washer maybe damaged when wrong
usage or other reasons, please replace a new one.
1. Firstly, pick out the seal washer with a tiny metal stick (Show as
figure 31), and take out CO2 connector (if only replace the seal
washer, this step can be cancelled). Be careful do not damage other
parts of regulator.
2. Install a new CO2 connector in the regulator (leave the sharp
end outside toward), and install the seal washer (Show as figure 32).
Don't remove other parts of regulator during the replacing process.
Warning: Remember press the seal circle with empty cartridge
instead of new cartridge, or will cause hazard.
Regulator
Slim metal stick
Figure 31
Empty CO2 cartridge
Figure 32
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CO2 connector
Seal circle