Anet A8 Belt tensioner Y axis

I noticed that my old belt tensioner is subject to vibration during operation.
I would like to take advantage of someone else's operating time.
Unfortunately, the original design did not match the size of the holes on my printer.
My printer acrylic 7.62 mm thick.
I made a model using the original idea.
I did tides and cheeks for bearing.
I installed bearings 623ZZ instead of F623ZZ, old very tired ...
P.S.
Adapted by For ABS
My program modeling does not support Boolean operations
3D mo