Ron,
That pin goes all the way through and is welded on the back side of that plate and is welded to the bottom frame.
Farwell,
I took a file to it to see if it was hardened and the file cut inside the metal pretty easy. I think a hardened pin wouldn't have broken like it did.
DanielAlexander,
It's a machined pin with threads machined on the end. It also has a hole drilled in the threads. A cotter pin is put through the hole which keeps the bolt from coming loose.
Soundguy,
Thats a great idea. Kind of wish I'd done that. I went ahead and cleaned up the pin and removed the paint from the plate. I beveled the inside of the hole and put the pin back in the hole. I welded around the pin and inside the bevel (first weld). Example --\| |/-- Then I welded another pass around the pin and plate again (wider weld this time). The last pass I made was the widest weld I made. This weld was like a snake weld, up and down. As I was welding this snake pattern up and down, I would stop for a brief second so the weld would puddle up or build up pretty good. I put it back together and tried it out, so far so good.