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X carriage and v wheels problem

Hello there I have recently started putting together my xyz carve and I’m almost done but I have noticed the x carriage riding the Y axis left side is leading and right side is behind by 1 cm to be noted that everything is square and I double checked and my second problem is with the v wheels that ride on the Y axis , on both sides only 3 of the v wheels are touching the rails and are a bit tight and one of them is not touching at all , I would appreciate some help .

Hi, are the excenter nuts adjusted?

Double checked if the bar is straight (transport damage???)