Lightweight and strong back axle assembly for XRAY XII features a super-light and tough graphite shaft that is specifically machined for perfect stability and smoothness. The threaded shaft is specifically embedded in to the end of this graphite axle. The CNC-machined aluminum mounting dish is precision-pressed onto the axle and it is aligned and pinned to put it solidly and perfectly in position. The whole installation is perfectly balanced with zero run-out for vibration-free operation.