I think I'm suffering from the wiggly 510 adapter as well. It was perfect for a week. Then, last night, I was about to unscrew my atty for the night (as I always do), and the brass fitting was turning with the atty. Having never taken it (nor my Prodigy) apart, I just grabbed some needle-nosed pliers to hold the fitting still while I unscrewed the atty.
This morning, I took the adapter off, and the fitting just fell right out. I can put it together and get an atty on. It's still as usuable as ever. The only real difference is that I notice I can now press down on the cart/atty and it has a little bit of give to it. I swear that wasn't there before.
I put in a ticket today. I was just curious if I had done something wrong -- such as overtightening, which I try to not do. Or I'm wondering if there are any other issues, such as increased leakage from the not-as-snug fit.