Brother bas-311hn Instruction Manual page 34

4. PREPARATION BEFORE SEWING
3683B
3684B
26
Adjusting the bobbin winding amount
Loosen the screw (6) and move the bobbin presser (7).
If the thread winds onto the bobbin unevenly
Loosen the set screw (8) and move the bobbin winder
tension assembly (9) up and down to adjust.
* For case A, move the bobbin winder tension assembly
(9) down, and for case B, move it upward.
Case A
Case B
BAS-311HN, BAS-326H