Hello, Mike . I cleaned all of the crud off the adjusting nut, but no markings. The knurled nut is brass, and so is the yoke. Looking at the raised piece below the tote, ( second photo) I noticed that this was also brass. I didn't see a weld , or a braze. So I looked at it from front to back, and I figured it must be friction fit. Sure enough, I was able to tap the brass piece toward the heel, ( 3rd photo) and it released!!! The brass piece is dovetailed to piece on the casting. No sign of a weld, so the piece on the casting must have been machined into the rough casting?? Regards, Lou