This motor drive incorporates a stepping motor and brass drive shaft with spur gear which are regulated by a very accurate quartz oscillator. Their circuits are designed to keep tracking error within 0.005% of sidereal time. The cast aluminum housing with dovetail track attaches readily onto GP type mounts. The MT-1 can also be adapted for use on the now discontinued Vixen SP type mounts, please ask to see our tech note for SP mounts on Mount Accessories. One motor is required for each axis driven. If you order the mount from Company Seven then we will install this for you.