221,222, 301
There are two tiny screws on the side of the bobbin case. When you are holding the bobbin case with the bobbin down the screw on the left is the screw - 200592 - that holds the tension spring on.
The screw on the right is the adjustable screw -201016 - for bobbin tension,
The screws are NOT the same. 
These are really Tiny!
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