I read online that this particular type of clothes washer has 4 springs to keep the basin in balance during the spin cycle. If one of the springs becomes worn, the washer will tend to become noisy and shake violently during the fastest part of the spin cycle. I ordered 4 sets of spring assemblies (including the rod and other components), because it is recommended to replace all four springs at the same time. I was able to replace the parts myself, which saved me a few hundred dollars instead of hiring a professional. The job took about 15 minutes. It doesn't require advanced training. Just watch a video on Youtube to find out how to do this easy repair.
The parts arrived in about a week. During the week I waited, I did not use the washing machine.