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The knobs below will fit the AstroSystems 2.0 and 2.14 secondary, both of which use the same knobs. AstroSystems secondary assemblies are used in several different Newtonian designs such as the Starmaster series, and are characterized by four collimation screws instead of the usual three.
A. Knobs for AstroSystems 2.0 & 2.14 Secondary
Fits: AstroSystems 2.0 and 2.14 secondary
Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Stainless steel