Bob's Knobs for Celestron PowerSeeker 127 Secondary: Effortless Mirror Adjustment Tailored for PowerSeeker 127 Telescopes: Specifically designed for the secondary mirror of Celestron PowerSeeker 127 models. Part Information - Part: CNsec35: Perfect Fit: Compatible exclusively with Celestron PowerSeeker 127 telescopes. Knob Specifications: Constructed from black plastic, each knob measures 16 mm (5/8”) in diameter, facilitating straightforward adjustments. Durable Threads: Equipped with stainless steel threads for lasting performance and reliability. Compatibility with Factory Dust Cover: Unaffected Dust Cover Fit: The factory dust cover remains fully functional and will fit as normal even with Bob’s Knobs installed. User-Friendly Telescope Tuning: Ideal for Celestron PowerSeeker 127 owners seeking a simple and effective solution for secondary mirror adjustments. Enhances Telescope Maintenance: Provides a convenient, tool-free method to accurately align the secondary mirror, enhancing the overall observing experience.