I am back at my mother's house again 2 hours away, fixing her tenent's shower valve. It is a 3 knob control, hot-diverter-cold control valve. The cold water valve stem need replacing. I cannot figure out what manufacturer makes the valve control. I have a detail drawing after I made some measurements. Sorry, no photo, just the attached hand drawing.
From the drawing, is it possible to figure out what make it is? Home Depot plumbing guy is looking at it like it came from mars. I'll be trying plumbing supply store next. I cannot bring the stem with me to the plumbing shop for any extended time. It still works some what so I have to install it back while I go hunt for the stem.