Bob’s Knobs SkyWatcher 5″ – 10″ & C6, C8, and C10; Newtonian Secondary Collimation Knobs
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Wayne W. Verified Buyer –
I bought a new sky-watcher 8″ f/4 newtonian and immediately tore it down to do all the mods. One was replacing the secondary spider and adding bobs knobs. They work great and a complete collimation is about 60 seconds now with the laser Collimator. I highly recommend replacing the original screws with Bob’s Knobs.