BT-DT ...
Is/was there a rubber double-gasket that wraps from the outside of the shell through the hole and on the inside of the bladder as opposed to the flange being glued/welded in place?
If so, you can probably just use a standard bladder flange assembly like this:
www.divegearexpress.com
Add their dump valve since the thread sizes vary depending on manufacturer and year:
www.divegearexpress.com
And the tools to do it yourself:
www.divegearexpress.com
That is $25 in parts and tools. I'm sure someone on the way down would bring them to you if you ask nicely ...
It is a 5-minute install and we could talk you through it.
Of course the above mentioned Tech shop probably has a set lying around if you are willing to take a ferry ride. ETA: I'd call first.
Is/was there a rubber double-gasket that wraps from the outside of the shell through the hole and on the inside of the bladder as opposed to the flange being glued/welded in place?

If so, you can probably just use a standard bladder flange assembly like this:

DGX Bladder Flange Assembly
A replacement bladder flange for older style BCs that includes the inner and outer fitting plus the intermediate seal. Please read the description details carefully for compatibility advisory.

Add their dump valve since the thread sizes vary depending on manufacturer and year:

DGX BC Overpressure Relief and Dump Valve
A replacement BC Overpressure Relief and Dump Valve w/o flanges. Please read the description details carefully for compatibility advisory.

And the tools to do it yourself:

Bladder Flange Tool
The Bladder Flange Tool works with Dive Rite bladder and OPV flanges.

That is $25 in parts and tools. I'm sure someone on the way down would bring them to you if you ask nicely ...
It is a 5-minute install and we could talk you through it.
Of course the above mentioned Tech shop probably has a set lying around if you are willing to take a ferry ride. ETA: I'd call first.
