Troubleshooting suggested the Armature, talk about the hardest part to get to, (it was a little concerning - a lot of steps). Your step-by-step videos were exact. Especially putting everything back together. We also cleaned/replaced all the old grease, Motor brushes, and the Speed Control plate. (just to be sure) Ours is the K5SS model, so it's old. After all the work, the sound of rotating parts was perfect!
Thank you so much.
Sincerely,
Alice F.