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Not only does a TDC work well on a PDI chamber, it's my current working configuration lol
The dual arms are totally useless, and I think they're REALLY only there to correct any issues you might have in not being able to align the barrel properly due to the crap design. So I've just got one bolt pressing on both arms.
Not sure why anyone's worried about bottoming out an arm. It's an Rhop. It doesn't have to go down very far to get full hopup, and even if it did somehow bottom out, just put a thick nub between the arm and hop rubber...
What Drakker is talking about with the Mnub is that your hop arm isn't pressing on it flat. It's pressing at an angle because it's so thick. Easier solution is to just make the Mnub shorter until the arm presses down on it pretty much flat.
The PDI chamber just absolutely is not designed for flat hops. Or convenient operation. Actually it really only serves to eliminate ONE issue (left/right hop bias) in an over-engineered and frankly, unnecessary manner.
If they're going to use O-rings, it needs to be higher tension and needs to be mounted right at the end of the arm for maximum tension.
Hop window needs to be longer and squared.
adjustment is just a huge pain in the ass and it needs to be TDC'd anyway so screw O-rings altogether.
and there's no positive alignment for the inner barrel. You just kind of eyeball it and lock it in place with set screws.
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