Wouldn't be too hard to make up a little jig to go in a press to form the heads on some 7/16" rod, they're not flared out all that much. Do 5 at a time or something like that. The trouble here in NZ is getting 7/16" rod in anything more than mild.
I'm using lead plug track, so it's just plain pins. Otherwise it'd be fun to have a go at making some headed pins
