SINGER W1588 - Manual (Page 15)

To test bobbin tension, hang and
shake bobbin case as shown.
Adjusting Lower Tension
At proper tension bobbin case
will
gradually drop a small
amount.
To adjust tension, turn adjusting
screw with small screwdriver.
Raise needle in the highest
position.
Leave end of thread of about 10
cm (4") from bobbin case.
Take hold of latch and push
bobbin case into hook.
Release latch when bobbin case
is fully inserted.
Drop Feed Lever
The lever is under the slide plate.
To lower feed dog, move lever
1:0 Ü position.
This position is for button sewing
darning and embroidery.
For normal sewing, move lever
to AA position.