Bob's Knobs Vixen R200SS primary

Bob's Knobs for Vixen R200SS Primary: Enhance Collimation Precision Optimize Your Vixen R200SS: Elevate your telescope's collimation precision with Bob's Knobs designed for the Vixen R200SS primary. Part Details - Part: R200pri: Collimation Knobs: These black plastic knobs, with a 13 mm (1/2") diameter, feature stainless steel threads to ensure reliable collimation adjustments. Locking Knobs: Easily identify and use the red plastic knobs with a 16 mm (5/8") diameter and stainless steel threads for securing collimation settings. Important Notes: Staggered Height: Due to the proximity of factory collimation and locking screws, the knobs must be staggered in height. Locking knobs extend further for easy identification. Compatibility: Early R200SS versions may use metric M5 screws for primary adjustments instead of the M4 screws provided. If M5 screws are needed, please specify this during checkout. Handle with Care: Protect the locking knobs from damage and avoid using them