"bob prohaska" wrote in message
news

http://www.zefox.net/~bp/shower_valve/

Thanks very much for the double-d tip!

bob prohaska

It may have been assembled with an open-end wrench before it was
placed in the wall. I'd look into modifying a cheap 3/4" or 19mm deep
impact socket, perhaps anneal it, drill / bore out the ID, mill
(grind) clearance notches across the end and turn it with Vise-Grips.
-jsw