BAADER CLICKLOCK REDUCER FROM 2" TO 1.25"he Baader ClickLock System is a precise accessory clamp without locking screws. The eyepiece, diagonal or accessory used is held without the inconvenience of the thumb screws which causes tilt and therefore changes the collimation of the optical system. This reducer from 2" to 1. 25" fits on 2" barrels and holds 1. 25" accessories. On the telescope side there is an M42 x 0. 75 (T2) thread as well as an M48 x 0. 75 thread which allows you to attach any