Knobs: Black plastic, 16 mm (5/8”) diameter
Threads: Black anodized aluminum alloy
- These telescopes can have factory collimation screws with either standard or metric threads. Silver Phillips collimation screws are standard thread. Black Phillips collimation screws usually have metric threads, but some have standard threads. Telescopes manufactured prior to about 2008 have collimation screws with standard threads, and later scopes have collimation screws with metric threads.
- The factory dust cover will fit normally with Bob's Knobs installed.
- The rotary secondary cover must remain open when knobs are installed. The cover is cosmetic only and will not affect operation of the telescope.
- Our knobs cannot protrude above the Trifid-style decorative attachment or they will interfere with the factory dust cover. For better knob access, you can peel off the vinyl escutcheon and remove this attachment, or simply access the knobs partly from the side.