I am considering getting a stem, which is meant for a 26mm grip area diameter. However, the handlebar I want to use it with is 24mm diameter (this diameter is uniform, so 24mm both at the grip and at the edges). Since the difference is small (~2mm), would it be reasonable to expect the stem to grip the handlebar well enough when tightened?
If not, is it possible to shim the difference without compromising safety?
If these specifics matter, the stem is Deda Murex, and the handlebar in question is a vintage bullhorn from a French company named Belleri.