This 2" "Giant Masterglide" crayford type focuser custom made by Van Slyke Engineering is a beauty. It has 3" of travel and a built-in draw tube to provide an extra 6" of extended backfocus.  Place your mouse pointer over here to for a view of its back, - showing its dual focusing knobs for both coarse and fine focusing. This view Also shows the powerful, gear-reduced, Pitman motor.  The draw tube sports a compression locking mechanism as well as 2 thumb screws.
This is one very well made crayford focuser. It is priced at $695.00 US plus $32.00 US for shipping to locations inside Canada.  Place your mouse pointer over here to restore the front view of the focuser. The glider wheels in the 4.5" diameter housing are evident in this front view.
To get an idea of this giant's size take a look at the 1.25" eyepiece beside the bottom left of the focuser in the front view.