I got a new cylinder of argon for tig welding and noticed the regulator would not screw on. Had a closer look and realised the thread is damaged. I'm not going to force the regulator on, although I know that some people may be tempted to "just make it work". The dent is somewhat close to the sealing face, so I'm absolutely going to return it. I'm a bit surprised this ended up unnoticed by the supplier. #industry