Question about SewShop.com Singer Model 1021 Instruction Manual
On the outside of the bobbin case where you pull the bobbin thread around and down a small; slot to under a small flat spring
that flat spring is the bobbin thread tension and is adjusted by the screw that holds that plate on
a very small amount of turn of that screw make a large difference to the tension
However if your problem is birdnesting under the material ( total mess) then the problem is not bobbin tension but the needle tension is too loose and not pulling up the bobbin thread properly
Posted on Jan 26, 2016
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