By the way,
For those who are interested in Mesu group : https://groups.io/g/Mesu-Mount
De : Sitechservo@groups.io <Sitechservo@groups.io>
De la part de Yann-Eric Boyeau
It might be the DEC axis encoder that was not tightened enough and got loose.
It is hidden in the counterweight bar housing under the DEC plate.
I already inspected these parts on my Mesu 200M mk1.
We might continue to discuss the issue on the Mesu group or send me a PM as this is not closely related to Sitech Controller.
If the Dec encoder is simply loosened, this is a small issue and easy fix.
Lucas can have a look with you by webcam.
I'm not a Superstitious person, but it did occur to me a few posts back when I mentioned about my MESU 200 that 'nothing had ever gone wrong with it, that it might just be tempting fate.