First of all, the Mark-X tracks very well even without a counter weight, it means that the Carton motor is delivering plenty of torque.
Secondly, the Maksutov snaps into focus, and star images were well formed. The trapezium is well resolved even at low power (75x with my 82 degree Japanese Widescan Type III), and it's a very ice view with my Nagler 13mm!
By placing in the Lumenera Lu070M, I could see quite a lot of nebulosity when the transparency improves just a bit... the sky is foggy tonight.
I have examination the inside and outside focus pattern and found the collimation good. I just need a planet or the moon to really verify before I proceed for a solar filter for it.