Singer Featherweight 221 222 and 301 Highest Quality Bobbin CaseHighest Quality Singer 221 222 and 301 Replacement Bobbin Case Available. Don't be fooled by lesser quality bobbin cases. TOWA bobbin cases have been the only replacement bobbin cases for the Singer Featherweight and 301 machines which have proven consistency to work properly in your machine. Using an improper bobbin case may result in jamming, thread issues, or damage to your machine.