3 Collimating knobs for Celestron C14 w/Allen or slotted collimation screws

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These no-tool collimation knobs fit those Celestron C14 Schmidt-Cassegrain telescopes that use Allen or slotted-head collimation screws (including those with a partially raised "Trifid" housing that rotates to cover and uncover the collimation screws) . . .