Sodastream cylinder adaptor

I have bought a pressure reductor for my CO2 project and was gonna use the Sodastream CO2 cylinder with W21.8. I realised quick these are not compatible... so instead of buying an adaptor I decided to design one, what opens up the CO2 cylinder valve as I screw it together.

The have enough space I had to buy a "15mm hex extension brassfitting" and put an O ring inside.

The hex shape small part goes into the pressure reductor and shall just stuck in firm (you might need to file it a bit after printing). the upper cylinder house holds a M3 nut, might needed to be warmed up while installing to position. the M3 bolt goes firm and cuts a thread in the plastic while screwing into position.

This will create the adjustable valve opener piece. Adjust the screw before putting the parts together that it should just touch and press the sodastream cylinder valve when tightening the hex fittings. If not good enough adjust and try again...

I printed with 0.4 hot-end and 0.2 layer height from ABS.