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You introduce two additional surfaces which can slip and allow your bars to move. It's a bodge you can get away with if you're using straight bars as you don't exert any torque about the potential rotation axis, but something where you hands are a long way from that axis (BMX or drop bars, for example) it's a bit risky
gbj_tester
Tadpole
Can I use two handlebar shims, 22.2 to 25.4mm and then 25.4mm to 31.8mm?