Baader 2" ClickLock clamp to M54x1a – for Skywatcher / OrionThe Baader ClickLock System is a precise accessory clamp without locking screws. The eyepiece, diagonal or accessory used is held without the inconvenience of the thumbs screws which causes tilt and therefore changes the collimation of the optical system. This model fits on many Sky Watcher and Orion focuser tubes with M54 x 1 female threads. It holds 2" accessories. This model is compatible with Sky Watcher Quattro Newtonians and the Evostar 72ED.