i'm unable to get Upper tank shell installed on my STA-Rite system 2 filter

I removed upper shell, removed filter and cleaned it. I then started to reassemble the filter, upper tank shell, but for some brain failure I set the Posi-Loc ring on
top of the lower tank before placing the upper tank shell on and then installing the Posi Loc ring. Then I gave the ring a slight CW spin. Now I am completely
unable to unscrew the ring which turns 1" only. I cannot get it off. I also removed the safety latch which of course made no difference. I cant believe that they would design such a mistake. It sure was a mistake on my part.
 
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