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Common Newtonian-style telescope primary configurations: These knobs will fit most Newtonian reflectors made by Guan Sheng Optical, including GSO, Hardin Optical, Meade, and Zhumell models. Our knobs listed here have a screw diameter of 7 mm (collimation) and 6 mm (locking), and will usually fit your telescope if you select the knobs that match your scope’s aperture. If your screws are different, we can design custom knobs for your application. Contact us using the link at the bottom of this page for more information.
We also offer stronger primary mirror support springs so collimation is retained while the locking screws are backed off for collimation adjustment. See Item D below.
Fits: 8” Newtonian telescopes manufactured by Guan Shen Optical (GSO), including Meade LIghtbridge, Hardin Optical, and Zhumell.