Bob's Knobs Astro Tech AT12RC Collimation Knobs - Secondary Mirror
Bob's Knobs Astro Tech AT12RC Collimation Knobs - Secondary Mirror
Bob's Knobs Astro-Tech AT12RC Collimation Knobs fit Astro-Tech AT12RC secondary. The knobs are made from a black plastic that is 16mm (5/8") in diameter. The threads are stainless steel.
With Bob's Knobs installed the factory dust cover will fit normally.