kirkp,
What I meant was a rod, commonly sold as drill rod and is used to make a lot of different things. The difference between my suggestion and Kutter's is the material, from which the rod is made, and the method of hardening( through hardening in my idea and surface hardening in his).If you can't do the "blacksmithing", maybe there is a knife maker( "bladesmith")or farrier in your area that can block them out for you to finish up.
You could likely do the job with flat stock, but if you lack a lathe it means significant file work to wind up with two precise diameters, offset by a precise amount, and they still should be hardened.
Mike

Last edited by Der Ami; 01/07/18 11:38 AM.