I contact with Chai i ask him to see the videos and he told me
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Dear Vagelis,
Can you adjust it as this linked instruction:

Screw Shaft Straightness

AS you know, the ballscrews have to be checked and adusted Before they are mounting to the machine.

Thank you very much for your consideration and cooperation!

Chai

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Has anybody followed the above procedure for ballscrew straightening?
I am not sure for the result.