Parks 1.25" Rack & Pinion Focuser for sale. The focuser is in excellent shape, and includes a cap, as well as mounting screws. The following is taken from the Parks website under focusers(http://parksoptical.com/tmc.htm):
"Up to date design, helical-cut rack and pinion focusing mounts. Smooth backlash-free operation for precise focusing. Ideal for visual and photographic applications. Heavy duty all metal construction machined to exacting tolerances. Precise fitting non-vibrating action with positive stops at each end of the rack-travel. Focusing tension is fully adjustable to suit each individual application. The versatile base allows attachment to any tube size from 4" to 22."
You can also look at the website for a picture of the focuser.
Will sell for $35 total (shipping included in CONUS), or $30 for pick-up in the Los Angeles area.