Watched several videos on the repairs most likely needed to fix my problem. I had bought my washer/dryer used and the washer had always had a pretty good shake/vibration when spinning, but had recently become even more violent. Searched for the recommended parts and discovered Appliance Parts Pros.com. Also watched videos associated with the parts I needed to replace which were with the listings of those parts. Needed were the suspension springs, tub spring, and the balance ring. I replaced them all myself, problem solved!