Tools are only as good as thier operators.
Remember valve adjustments?
If one does not understand the full "dynamics", most everything and a anything can be done WRrrrrong !
A common problem is not cleaning the wheels off really well B4 balancing.
Another is that on a spin balance is to get the weight on slightly off target, now the machine wants another somewhere else to counter the mistake, cause it does not know anything but numbers.
Most tire shops will just do that, rather than take the time to do it correctly, one weight inside/ outside.
On we could go here .
My little machine does a very fine job , no buzz or feedback.
