Check out the Winding a Bobbin Guide | Singer.com
Singer heavy duty 4423 won't catch bottom bobbin thread… : r/sewing
Help! I'm having issues with my Singer Heavy Duty machine jamming. : r/sewhelp
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singer heavy duty 6380m not picking up bobbin thread - details in comments : r/sewingmachinerepair
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Bobbin area keeps jamming! Plz help asap. Need project done by this weekend. // Singer Heavy Duty : r/sewing
:max_bytes(150000):strip_icc()/fixing-bobbin-thread-bunching-looping-tangling-2978069_FINAL-5b3fc24846e0fb003721e22a.jpg "How to Fix Bobbin Thread Malfunction, Bunching, and Tangling")
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Singer heavy duty (4452): the thread doesn't catch with the needle plate on. : r/sewhelp
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