Lever handlebar mount: a clamp with a bracket to which the brake or clutch lever is attached.
Replace it if there are cracks, stripped threads, or play on the handlebar, when the lever wobbles or turns. Compare the handlebar diameter and the lever type with the old part. Tighten the new mount so that the lever does not wobble, but also does not rotate on the handlebar without effort. It is best to compare the exact dimensions and fit with the old part before ordering.
