Make sure the M3x8 screws holding the top brackets in place are still loose on the towers! Now tighten the M3x35 belt tensioner screws until the belts are all equally tight and make a low twanging note when plucked.
Try to get all belts 3 as near to equally tensioned as you can!
Once the belts are tensioned to your satisfaction, only then tighten all the M3x8 screws on the top frame.
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