Lightweight and strong back axle construction for XRAY XII features a super-light and tough graphite shaft that's especially machined for perfect stability and smoothness. The threaded shaft is specifically embedded in the long run of the graphite axle. The CNC-machined aluminum mounting meal is precision-pressed on the axle which is aligned and pinned to place it sturdily and completely constantly in place. The whole installation is wholly balanced with zero run-out for vibration-free operation.