I bought an old steel framed Fuji a few years ago, stripped it down, and threw the pedals in a bin. I pulled them out today to see if they're worth keeping, and noticed this (see photo). The previous owner discovered the threading on a Presta valve was the same as the pedal screw, and put a Shrader/Presta adapter there to have it available if he needed it. I was a bike messenger for over five years, before clipless pedals, and I can't believe I didn't think of this.