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Bob's Knobs Takahashi TSC-225 SCT
$22.95
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}Bob's Knobs for Takahashi 225mm f/12 SCT Secondary: Precision Collimation Made Easy Effortless Collimation: Achieve precise collimation with Bob's Knobs tailored for Takahashi 225mm aperture f/12 Schmidt-Cassegrain telescope secondary mirrors....