Send it to manufacturer would be prohibitive expensive, AFAIK that brass screw cannot be removed (correct me if I'm wrong)Oring might be captive in the body, does the screw come out? Or is that retained? Maybe the collar unscrews.
Could be a diaphragm issue, with the leak coming out through screw. Either way think you need to disassemble more or send off to manufacturers.
Looks like there are 2 flats on the main body, is that right? Big spanner on those to unscrew I would guess. Link below might be useful to diagnose.Send it to manufacturer would be prohibitive expensive, AFAIK that brass screw cannot be removed (correct me if I'm wrong)
So now what can I do?
How can I open the rest of the regulator?
I just called my local CO2 gas provider, they have a workshop, I'm gonna take it with them to heard their findings, anyways I still have to open it, so they have way way more experience than me.If I was you I’d contact GLA about it. Second hand or not, they may be able to provide some insight or point you in the right direction.