Originally Posted by thkyle
Put a tiny little drop of loc-tite on the threads, and screw on the cup seal. Don't want to get any on the seal if you can help it. That will keep it from coming loose, and you might not have a problem again.
That seal and the o-ring should last a lot more than 2 years, unless you're an auto triggering mad man out on the field!
Agreed on all counts. I had my first Phantom for almost 10 years and never replaced the cup seal. I flipped it over once (I was running it on liquid CO2 and some gunk got sucked in & nicked it), but otherwise never had an issue with it. I did loc-tite the cup seal onto the powertube, though, as suggested, because it had worked itself loose once. Once.