Truth: Prewound bobbins hold up to 3 times more thread than self wound bobbins, saving you TIME. These bobbins are wound by high tech machines which provide a smooth uniform wind.
Myth: Using prewound bobbins will void the warranty on my machine. Not true! Bob personally checked with many machine companies, and most sell prewound bobbins. The only risk is that you need to make sure you are using a good quality thread (like Superior Threads SuperBobs) and clean your bobbin area regularly.
Truth: Approximately 70% of the machines on the market are compatible with the standard "L" size prewound bobbins.
What does "L" and "M" style mean?
Answer: Two of the most common sizes of prewound bobbins are "L" and "M". With home machines, 75% use "L". Most Long Arm machines use "M" although some use "L". To read which machine is better suited to a bobbin type Superior Threads has a list on their web site.
Look under HERE.
Most prewounds have cardboard sides. Do I need to remove them?
Answer: It depends on your machine. Either none, one or both sides can be removed. Experiment with your machine. If the bobbin fit is too snug to accommodate free motion, take it off. If the machine has an automatic bobbin sensor, leaving the cardboard sides on will make the sensor think the bobbin is always full. Solution: tear sides off or sew until bobbin thread runs out.
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