Socket for Fluidmaster 400

Needed to change the flush valve in our toilet. The old one was a Fluidmaster 400 (1/2"), and had been there so long the water had calcified the nut, making it near impossible to remove. Add to that the it was recessed so I couldn't reach it with any of my other tools. Made this socket to fit on a 1/4" socket wrench. Problem solved.