I'm curious about how the Dremel is used and what attachments/tips are used. I don't get that part
I don't recommend using the dremel tool on your machine. This sewing machine head has some kind of clear coat on it and it's spent many, many summers in the TX heat in an enclosed shed. So, it's probably baked at 90-115+ degrees for six months out of every year for a minimum of 30 years, most likely 50 years. Stick with what Glenn suggests. Mine was a special case.
Best wishes!
Marcy