Trying to get to the bottom of this issue. I have searched the web and this site extensively and it appears to be a split jury on use of PVC or ABS fittings for threads in hollow vessels/urns. Obviously, it can be done and that is well documented but I also see posts suggesting that the threads jam easily. So the question is should I or should I not use this technique. I really don't want to pay a premium for brass and they are not that easy to find around 2 inches in diameter. I also really don't want to make a beautiful vessel and screw a top on and get it stuck. Is PVC (white) better or worse than ABS (black) as far as jamming?

I'm interested in hearing your experiences. Thanks!