I really like my Toptank. I have several back up RBA heads and had that screw out a couple of times on all of them to dry them after a rinse without any problems. You must have gotten a bad one or put too much force on it perhaps.
The RBA is pretty cheap to replace though, I would just try another one. I'd be happy to send you one of mine if you pay for shipping but it is probably cheaper for you to pick one up locally.
Just send me a pm if you want to take me up on that offer though. My spare ones are the V2 Plus with the bigger
juice holes.