This system is made specifically to mount the SV70ED on any Stellarvue telescope using our dual mounting rings with flat tops. It mounts to both rings adding guidescope level stability. It includes two heavy duty, quick release, dovetail shoes, a dovetail rail that is 8 1/2"" long and two 96 mm inside diameter, adjustable rings for the SV70ED. Use this if your rings are 7" or less apart. If the main telescope rings are more than 7" apart, use the RS70M below. The dovetail shoes attach to the tops of the main telescope mounting rings using two screws each, 1.5" apart. The dovetail rail and guidescope rings slide into these shoes. Each ring has three stainless, nylon tipped, adjustment screws.