SINGER W1805 - Manual (Page 18)

Adjusting Lower Tension
To test bobbin tension, hang and
shake bobbin case as shown.
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.
Darning Plate
There are a few times when you
want to control the feeding of
the fabric yourself. Raise needle
to its highest position and raise
presser foot. Place darning plate
over needle plate aligning two
pins of darning plate with holes
of needle plate.
You may then determine the
movement of the fabric yourself.
See page 39 for embroidery.