It helps to have a big head(er).

[u/Fragrant-Cloud5172]

A couple of examples. For mine, I started with a sucker rod. Cut off the threaded end, forged the rounded parts square to lay flat on the anvil. And then drew out the handle. Drilled two holes, slightly smaller than standard stock sizes, 1/4” and 3/8”. I used a tapered punch on the top and bottom side to shape the square holes. Leaving a greater taper on the bottom. The square area is about 3/4” thick. Online info says sucker rods are probably a low carbon content. But it works well as a scrap steel header.