I have dated 1951 Reynolds drop bars that are 23.8 and require a shim to fit old GB Hidminium bars. I suspect this was always a thing.
Brass shim stock will work in most any application as will aluminum. I make sure to have any gap or overlap centred in the opening in the stem to prevent stress risers
Last edited by clubman; 01-14-22 at 06:14 PM.