![Amazon.com: Bequilter Bobbin Case #Q6A0764000 Compatible with Singer 4411 Heavy Duty, 4423 (Heavy Duty), 4432, 44S, 4452 Heavy Duty, 5511, 5523, 5532 Heavy Duty, 5554, 9100, ET-1 (Perfect Finish), HD6380M Amazon.com: Bequilter Bobbin Case #Q6A0764000 Compatible with Singer 4411 Heavy Duty, 4423 (Heavy Duty), 4432, 44S, 4452 Heavy Duty, 5511, 5523, 5532 Heavy Duty, 5554, 9100, ET-1 (Perfect Finish), HD6380M](https://m.media-amazon.com/images/I/61ngnQ8N1ZL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Bequilter Bobbin Case #Q6A0764000 Compatible with Singer 4411 Heavy Duty, 4423 (Heavy Duty), 4432, 44S, 4452 Heavy Duty, 5511, 5523, 5532 Heavy Duty, 5554, 9100, ET-1 (Perfect Finish), HD6380M
![Singer Compatible Bobbins Fits All Heavy Duty Models 4411, 4423, 4432, 5511, 5523 & More See Description - Etsy Singer Compatible Bobbins Fits All Heavy Duty Models 4411, 4423, 4432, 5511, 5523 & More See Description - Etsy](https://i.etsystatic.com/22548099/r/il/822b1b/3737172946/il_570xN.3737172946_9e43.jpg)
Singer Compatible Bobbins Fits All Heavy Duty Models 4411, 4423, 4432, 5511, 5523 & More See Description - Etsy
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Amazon.com: SINGER | Heavy Duty Holiday Bundle - 4452 Heavy Duty Sewing Machine with Bonus Extension Table for Larger Projects, Packed with Specialty Accessories Gray
![Singer Heavy Duty - Adjusting Bobbin Tension, Please read the Description before posting questions. - YouTube Singer Heavy Duty - Adjusting Bobbin Tension, Please read the Description before posting questions. - YouTube](https://i.ytimg.com/vi/-FI23OOjVMw/maxresdefault.jpg)