Having a bit of a panic. I attempted my first swap over to a new co2 cylinder as the old one has run out and when I tried to attach the new cylinder to the regulator (Co2 art pro-se) it made a massive hissing sound. It's leaking from the where the bolt on the regulator attaches to the cylinder and the psi is now stuck on 60 which doesn't make sense. I've attempted to connect it four times and still the same massive hissing. Can anyone shed any light on this? I assume something has gone in the regulator? The washer is still there but there appears to be no seal. Also, whilst I figure this out, should I stop EI dosing daily? Any help would be appreciated. Thank you!