Material for clamping wedges

In the ongoing saga of repairing the Elliot Sturdimill, I have found that 2 of the wedges that clamp the table swivel need replacing. These are 3/4" round rods, milled to a flat section, approximately 3/8", with a wedge on the lower surface. These fit into the swivel clamps and clamp the swivel when they are forced in by a captive hollow screw on the outside of the 3/4" dia. at the outboard end. I need to make replacements for these rods and I was wondering what grade of steel to use; my local tooling supplier keeps EN1A (freecutting) steel and silver steel, but I guess EN1A would be too soft and would burr up or bend in use; the silver steel seems slightly OTT as this is precision ground stock. Any suggestions? Martin