A wheel servicing machine includes a releasable swing arm clamp apparatus attached to a swing arm. The clamp engages a rod slidably attached to and extending from a slide bar mounted on the swing arm. The clamp includes a closed, or locked, position and an open, or unlocked, position. In the closed position, the apparatus includes a rod clamp that can be rotated about the rod for fine adjustment of the angular position of the swing arm. When the rod clamp is in the open position, the angular position of the swing arm can be coarsely adjusted by manually moving the swing arm about a pivoting arm joint. When the swing arm is moved near a desired position, the rod clamp can be closed and can be rotated about the rod in the closed position in some embodiments for fine adjustment of the swing arm angular position.