I have an 8 or 9 yr old Maytag Performa washer. It has the plastic
tub. I lost the manual and don't have the model #. Is it somewhere
on the machine?

Most times during the spin cycle, the tub hits hard and loud inside the
washer. It is hard enough where the washer moves. I have to adjust
the wash to make the tub more balanced, then it's fine for the remaining
load. Only happens once per load, but is a pain sometimes.

What is this? Worth fixing? TIA