Mrs Sew and Sew, That is CLEAN and BEAUTIFUL!!!!
The motor looks so pristine, I doubt there is so much as a speck of carbon missing from the brushes.
Auntie Candace is the Bernina Momma. She will know the answers to your questions.
I am so impressed with your patience and go-to-it-ness! You just started collecting such a short time ago and you have really dived in head first. You are an inspiration to me.
You will not be wanting to re-home that 730, by the way :-)