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The Vintage Singer Sewing Machine Blog: How to Oil Your Sewing Machine (Using the 221 Featherweight as an Example)
Oiling your vintage sewing machine (SINGER 221 Featherweight shown)
All you need to know about Featherweights
Threading Along: A Martha Washington sewing cabinet
The Vintage Singer Sewing Machine Blog: Screwdrivers, Part 3: Which Set Do I (or Don't I) ...
Singer Featherweight Card Table | Reproduction | Singer 221-301
Treadle On is dedicated to promoting the use of antique and vintage human powered sewing machines. Huge site with how to select, repair and use your treadle machine.