Bob’s Knobs Celestron f/11 C14 Secondary Collimation Knobs – Metric Phillips
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Greg S. Verified Buyer –
I like Bob’s Knows. The only problem I had was one of the know and would loosen and the plastic portion over the screw broke off. Fortunately the screw has a Allen head and was able to loosen the screw. I still recommend Bob’s knob’s.