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This is where a few pictures would help because your nomenclature is nor making sense, to me.Threading on the bladder where the shoulder piece attaches.
(I am not sure where any other threading on any bladder is but more importantly, it's a technical-ish question that someone who has worked with a bunch of different BCDs might not, but most people won't, because not too many people have twenty or thirty different kinds of shoulders hanging around.
I do have a bunch of shoulders, but I cannot find the chain of test shoulder fittinge I have arranged and labeled, because I only need that once in a blue moon.
I just need it now, because I my old bladder finally gave up the ghost...
it's a technical-ish question that someone who has worked with a bunch of different BCDs might not, but most people won't, because not too many people have twenty or thirty different kinds of shoulders hanging around.