Thanks for the reply Warlord. The nipple in the ASA is solid and I understand what you are saying, I will try and put an o-ring inside the ASA and see if that works.
It is almost like the o-ring is catching on something and maybe getting pinched inside the ASA. I say this because I cannot fully screw in the tank. Anyway I was thinking about getting a new ASA and drop anyway so I am hoping that will fix my problem. I will let you know if that trick works.