Inside the brass adjuster on the regulator, there is a tiny screw which looks like a set screw. A 1.5mm hex key fits it. There are no instructions for its use. Does anyone know if there is a torque setting for this screw? Is it supposed to be really tight? Or just run down through the brass adjuster snug like? I wasn't even aware it was there on the first one I installed, however on the second one, it was almost ready to fall out. As a side note, I think, maybe, my regulator adjustment has moved, but I'm not sure, (failure to record)(I should have photographed it) so maybe this screw is supposed to be fairly tight? Help