I want to use a BMX style handlebar on my MTB. The BMX had a 4-bolt handlebar binder set. The MTB has only a clamp-on 25.4 ahead stem with 2-bolt handlebar binder set. The 2-bolt binder set won't clamp firmly enough to keep the BMX handlebars from rotating inside the binder clamp. Is there a clamp-on stem set with a 4-bolt handlebar binder set? Otherwise, any suggestions on how I might be able to keep the BMX handlebars from rotating inside the MTB's 2-bolt handlebar binder?