This base for 3.5-inch Feather touch focusers is custom machined to match the outside diameter of the optical tube. Curved base with leveling screws for 3.5" diameter Feather Touch focuser Outside dimension is 6.0" square Base comes complete with all mounting hardware. The base has a mounting hole pattern of 5.25" to center Focuser adapter part# A35-503TMB is needed to thread focuser into base. Inside of base has M138x1 threads to thread tube adapter ring |
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