(Thanks, Dean) This is a beautiful JMI DX3 Crayford focuser with curved base and leveling screws. Mounting screws included. It sells new for $159; I am selling it for $89. The drawtube is 2.5 inches long, and the curved base fit the focuser block of an Obsession 20 inch scope perfectly.
Please write me with any questions. Buyer pays for shipping.