If the problem with your Performa washer is that the tub assembly goes out of balance no matter how small is the load and it hits the cabinet. The problem could be a worn out snubber ring.
The snubber ring is made of a plastic like Teflon. The purpose of this ring is to keep the drum assembly on the middle when the washer is spinning.
A lot of people replace the drum assembly supporting springs thinking that this will take care of the problem, to find out that the problem is not the springs, but it is the snubber ring.
To see how to check & replace the snubber ring in a Performa washer, view the video below
Below are the links to the parts needed for this repair.