In my search for steel to make prods from, I have come across what may be a useful source, which I wanted to share with the forum. I live in a very rural area with a lot of farms, and come across plow disks (AKA harrow disks) fairly often. I'm referring to these things here:
I'll admit, I've only played with one disk so far (and the prod I cut out had poor geometry with no tip rise, and ended up not being used ), but the steel itself seemed an excellent prod source.
These disks come in various sizes up to 36", and are generally 1/8" thick, medium carbon steel with a good spring temper. The arched shape automatically produces a good bow pre-bend, and unlike vehicle springs they aren't subjected to bending stress thousands of times.
In any case I plan to do some more experiments with these; a neighbor has a huge pile of old 16" ones. 1/8" is a bit thin, of course, but for pistol-bow or loose-laminate style prods I think these show a lot of promise.
Happy cross-bowyering to all ,