Bob's Knobs for Orion

  • Secondary Knobs for Orion and Sky-Watcher Dobsonians 30 mm
  • Secondary Knobs for Orion and Sky-Watcher Dobsonians 30 mm

  • These knobs with 30 mm screws replace the set factory secondary mirror collimation screws on Orion and Sky-Watcher Dobsonian telescopes. read more...
  • Our price: $20.95

  • Secondary Knobs for Orion and Sky-Watcher Dobsonians 35 mm
  • Secondary Knobs for Orion and Sky-Watcher Dobsonians 35 mm

  • These knobs with 35 mm screws replace the set factory secondary mirror collimation screws on Orion and Sky-Watcher Dobsonian telescopes. read more...
  • Our price: $20.95


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