Lol
That might work... I use a little noalox
to lightly coat the bottom of the Artic
and the top of the top cap before screwing down the tank on the mod.. Sorta keeps it from getting stuck...
Try putting the base in a wooden door jam and close the door to hold it tight..then use a shop rag or towel on the tank itself and twist firmly.... I got mine apart this way before.. Anyway , good luck!
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Noalox is good stuff, but you only want to use just a tiny bit...just the lightest coating possible or it can work against you as much as it can for you...just a tiny thin coating on the threads of your mod will help conductivity and smooth out any burrs or rough spots making the mod and it's connection points, including the 510, much smoother. However, too much Noalox and you can have issues.
I know you know this
@smacksy ....I just added this bit for the newer vapor that might not know what noalox is or what it's used for or that it can give you issues in excessive amounts and that the least possible amount should be used
Personally...I agree with
@OBDave ...nothing that the freezer has not been able to unstick....put it in the ole' icebox for a half to a full hour and try again, the drastic temp change will shrink the metal and should help "break the topper" free

Best of luck to you