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We offer knobs for the FPI Protostar secondary that has either 8-32 or 10-24 collimation screws. FPI Protostar secondary assemblies are used in several different Newtonian designs. Select knobs for your secondary from the list below.
A. Knobs for FPI Protostar Secondary (8-32 collimation screw)
Fits: FPI Protostar secondary assemblies using a 8-32 x 1 inch long set screw for collimation adjustment
Knobs: Black plastic, 13 mm (1/2”) diameter
Threads: Stainless steel