Knobs for 12” Newtonian telescopes manufactured by Guan Shen Optical (GSO), including Meade LIghtbridge, Hardin Optical, and Zhumell.

Article number: BKMLB12pri
Availability: On backorder
Delivery time: Ships in 2-3 Days from our Warehouse

Part: MLB12pri
Fits: Meade Lightbridge and GSO 12” (30 cm) f/5 telescopes.

Primary collimation

  • Knobs: Black plastic, 30 mm (1-1/4”) diameter, 5-point fluted
  • Threads: Plated steel

Primary Lock

  • Knobs: Black plastic, 25 mm (1”) diameter, knurled
  • Threads: Stainless steel


  1. If your primary looks different from our photograph, or already has factory collimation knobs, these knobs will not fit.
  2. The telescope optical tube assembly will clear the rocker box with primary knobs installed.
  3. One of the primary mirror knobs may interfere with the cooling fan connector. The plug will fit properly between the knob flutes, so leave this one knob stationary and collimate using the remaining knobs. If desired, you can leave the factory collimation screw that is next to the fan connector in place.
0 stars based on 0 reviews