I'm going take a guess here that on the original the groove for o-ring 16 on part 17 is not the same depth on the corners as on the straight sections. And on the clones, or at least on some of them the groove is the same depth the whole way around. I no longer have an original or the ability to measure that closely.
Either that or they milled out (5) just a hair too much. Or the o-ring wasn't the right size. Tobeco got it right though because my black version is absolutely perfect.
You have to tip them better, at x-mas...
Pfft. I had to go to the PO for at least half my packages.They're lucky if they get coal