Calling all vintage Singer Featherweight owners! Is your bobbin case worn out, damaged, or just not tensioning right anymore? This EverNice replacement is exactly what you need to get your beloved machine stitching smoothly again. It's a high-quality metal bobbin case designed specifically for the iconic Singer Featherweight models: the 221, 221K, 222K, and the 301. The part number you're looking for is #45751 (sometimes also labeled BC-HR221). It's a direct replacement, so it should fit and function just like the original part. Having a spare on hand is also a great idea for any sewist – because when a bobbin case acts up, it can ruin your whole project! This part is brand new and ready to install. Just make sure your machine is one of the models listed. It's a small part, but it's absolutely essential for proper bobbin thread tension and smooth operation. Keep your vintage beauty running like a dream with this simple, authentic replacement.