Originally Posted by MichaelB

FYI -- The bobbin size for the Consew 99 is #B74, which is being replaced by #204-230. The bobbin winder is a generic unit, driven by the belt, model #10734 or #259431. These can be had for $10-$20 either through ebay, or a shop that specializes in industrial machines. Be warned that the shops usually have a minimum mail order of around $50. I found the folks at www.southstarsupply.com to be both very friendly and quite knowledgeable.
The Consew 99 was replaced by the 199 "at least 30 years ago".