I'm down but not out here at home. Been sidelined on the couch with a possible meniscus tear in my R knee. Going to ortho dr today.
SO, I've had lots of time to read, look at machines and watch utube videos. I saw a great one this morning about taking apart and cleaning a sewing machine motor. When you all talk about cleaning the brushes I didn't understand, now I do. I know what a brush looks like and how it functions. I also know that a possible cause of your motor sparking is oil build up. Not that I'm ready to work on a motor but I find it helpful to learn about the parts and how they function.
First thing I'm going to do when I'm back on my feet Miriam is buy a few Junkers and work on them, thanks for the advice.