I see mostly rebar used for these tools. Locally, the top of the stop valve
looks like large flat head screw in reverse, a protruding ridge, rather than a
slot. Its pretty simple to heat a piece of 1/4" flat and fold it over to form
a wrench. Water meters around here aren't buried very deep, so in a pinch, I
can use a large adjustable wrench with a large screwdriver to twist it.
Gary Brady
Austin, TX