Feather Touch® 2.5" Diameter - Dual Speed Telescope Focuser 3.5" Draw tube travel, and Brake. - Lunt Solar Systems
Amazon.com : 1.25 Inch Telescope Focuser, 80mm Refractor Focusing Seat with Toothed Focusing Tube, Compatible with Standard 1.25in Reflector Telescopes, with Locking Screw : Electronics