Curved Base for 3.0″ and 2.5″ Feather Touch Rack and Pinion Focusers with Leveling Screws – Custom Machined to match your Newtonian tub.
This base threads into our tube adapter ring that comes standard on the 3.0″ Feather Touch focuser (A30-1903-1) which has M109x1 threads.
Base comes complete with all mounting hardware
Mounting hole pattern of 4.0″ to center.
Outside dimension of base is 4.75″