Most of my vintage machines are not picky at all and could probably sew with dental floss if I wanted too:> Vintage machines can easily have their tension discs cleaned. I do it all the time. Unlike computerized machines that have the tension discs inside the machine. I really wouldn't worry about thread for your machine. Use what you like and can find easily. I only use quality thread on my expensive, computerized machines...but my vintage ladies can take any thread I throw at them.