Does each telescope model require a different set of knobs?
Yes, each model of telescope generally requires a different set of knobs because secondary designs vary. As aperture increases, secondary assemblies also become larger, and longer screws are needed for collimation adjustment. Screw diameter and thread pitch can vary as well. We tailor knob diameter to the size of the secondary to make collimation adjustment as precise as possible. Therefore, always use knobs that are designed specifically for your telescope make and model.