BACHES Echelle Spectrograph

Even if it mechanically is possible, it will have one big disadvantage: T-2 has 42mm aperture, 2" Is 50mm. Means, you step down the aperture of the prism so that you will experience a vignetted field when viewing with long focal length eyepieces

The ETX 125 is a MAK (Maksutov Cassegrain) and not an SC (Schmidt Cassegrain). These are different optical and mechanical system. Therefore both have different threads on the rear end - and most accessories that are especially designed for SC do not fit to MAK telescopes. This is the case for our SteelStrack Focusers. The MAK has not enough focus travel in the focusing mechanism to move the focus far enough out to get a sharp image when the SteelTrack is attached. Therefore we do not offer adaptors for attaching the focuser to the MAK - it simply makes no sense, the combination will not work. Unfortunately we do not know about another focuser that works on an ETX MAK

Most of the adapters inside of the ClickLocks are not sold seperately, and the ClickLocks bodies are not all the same. But we do have have several SC-adapters, maybe one also fits to your telescope and the the SC-ClickLock: https://www.baader-planetarium.com/en/accessories/adapters-imaging-accessories/2-inch-sc-thread.html

Yes, this works!

If you add the depth of the housing, it is 25 mm - then one or two M42/T-2 spacer rings must be used.