Information on how to properly insert a bobbin into a SINGER sewing machine with a top drop-in style bobbin system.
Quick Fix - How to Clean and Insert a Drop in Bobbin Case
Needle thread catches under bobbin case. Singer 401A. Drop in bobbin. : r/sewingmachinerepair
With a finger held gently on top of the bobbin, pull the thread until it stops in the slot
Inserting Bobbin - Top Drop-In
Inserting Bobbin - Top Drop-In, Singer.com
Imagine a quick-set drop-in top bobbin! Simply lift the level, drop in a full bobbin, pull the thread through the slot and trim. It's SEW easy with Brother., By Brother Sews
singer sewing machine front loading bobbin
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She's A Sewing Machine Mechanic: Drop-in Bobbin Case Position