Are you using an inline CO2 reactor? To be honest, I have had leak before BUT the reason is because my tubing i used were old and inflexible. In addition, I was using an inline CO2 reactor which needed about 2 bar to push the co2 gas through. So as a result the leak happened at where I connected the tubing. I changed the tubing to a black high pressure tubing. The leak stopped.
So far I have changed the CO2 cylinder twice. Both times hand tigthened. I have also confirmed this with my LFS.
When you said you felt the leak.. can you try to remember whether the leak stopped because you readjusted the No2 location or because you tightened the solenoid to the cylinder?
I went to check mine. It is still tight and requires some strength from me to loosen it. This confirms that the thread design of the regulator is working as intended.
If yours feel loose after a period of operations... then the thread could be worn. Bring it back to the dealer and have it check.
Sorry but is the below setup categorized as inline co2 reactor? I am not sure which type is mine as I only bought the kit which is mostly sold here in Hong Kong. As for the tubing, I guess it's all good as it's not the same tubing I previously bought which is much softer for my airpump. The tubing included in the co2 kit seems to be harder.
I am totally sure that the leak came from the connection between solenoid and cylinder. I just shut the main valve of the cylinder and leak stopped. Upon doing hand tightening, leak still shows. That is why I tried to check the blue gasket and then re-position it and use a vice grip to tighten it. That's when leak stopped.
By the way, how to determine if the cylinder is all empty? And what is the proper procedure in removing and putting the solenoid back.
I have tried searching the internet but can't find any document nor video about this solenoid. I just want to make sure I am doing the proper thing.