Got the diluter today. Cool.
I took it apart, and found a pretty decent diaphragm, but probably unusable for diving. Bill has done a pretty amazing analysis of how the thing works, which I'm grateful for, seeing as how the thing is pretty convoluted in some ways.
I can't help but think there's a way around that bellows, which seems to me to be the weakest link. I think a smart feller with a will could find a way to use a rubber diaphragm setup to replace that hot mess...
Speaking of the first stage, and I say this with no knowledge of its potential; is the low output of the regulator to the diver a problem with the second stage? The orifice is small, and I'm wondering if the second stage is throttled by the small opening. As I understand the way this thing works, at this early stage, the 2nd stage output can be modified so it is piped directly into the air horn. Bill modded the complicated stock setup to do this.
But, if you caused the can to be charged by a secondary jet(s) and used a venturi aimed into the air horn, might you pick up more volume from an under-utilized first stage?