Starlight Flat Base for 3.5" Feather Touch 3500 Series Focusers - Swiveling
Curved base with adjustment screws
This base screws onto the adapter ring for the 3.5" Feather Touch Focuser (A35-503), which comes standard with an M138x1 thread. The base comes complete with all mounting hardware. The mounting hole spacing is 133mm, the outer dimensions of the base are 152mm square.