When Greg LeMond beat Laurent Fignon by 8 seconds in that infamous time trial with aero bars, Greg’s mechanics used a shim cut out of a Coke can. The night before, Greg went to check out the setup. He got on the bike and pulled up on the aero bars as hard as he could and they slipped. Hence, the Coke can shim. When I get home I’ll find a pic and you can actually see the Coca-Cola pattern sticking out on both sides.