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![Bob's Knobs Collimation Thumbscrews Celestron 14" Replacement Screw (BK C14) | eBay](https://i.ebayimg.com/images/g/xTsAAOSwZZ9jt0p6/s-l1600.jpg "Bob's Knobs Collimation Thumbscrews Celestron 14" Replacement Screw (BK C14) | eBay")
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