Solved Autolevel failure with Z axis sticky movement

https://www.facebook.com/video.php?v=10153352736523045

https://www.facebook.com/video.php?v=10153352743773045

My Robo3D R1 shows as video.
It is showing 100mm Z axis down. But left side Z pole shows sticky movement.
And it makes unexpected Z-end detection.

Please let me know any suggestion

 

I have recognized with each of screw-rod and Z-axis shafts are not aligned with same direction.
So I am trying to fix it Z-axis shaft with stabilizer stand now.
On this duration LM8UU bearing shows drops ball of it.
Do we have any guide for assemble Z-axis LM8UU way ?

regards

 

I could solve this issue with replacement Z-axis Rod and LM8UU for it.
And also making Z-axis stand as wider one.
Z-axis tuning for Verticality achieve screw side mount adjusting after Z-axis rod stand.
Now it move down with smoothly without sticking.

Thanks