A SERVICE OF

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Upper
tension
112
N
=
Setting
mark.
The
normal
tension
setting
is
in
the
white
range
between
3
and
5.
The
higher
the
number,
the
tighter
the
tension.
The
correct
lower
tension
Let
the
bobbin
case
with
a
full
bobbin
hang
down
freely
by
the
thread.
It
must
not
slide
down
by
its
own
weight,
but
should
gradually
move
downwards
when
you
jerk
your
hand
upwards
lightly.
Once
the
lower
tension
has
been
set
correctly,
only
the
upper
thread
tension
should
be
adjusted.
Lower
tension
O
=
Regulating
screw.
Turn
it
left
for
a
looser
tension,
or
right
for
a
tighter
tension.
P
=
Both
tensions
are
correct.
Q
=
Upper
tension
too
loose
or
lower
tension
too
tight.
R
=
Lower
tension
too
loose
or
upper
tension
too
tight.
I.
4
4
Q-’
j
-‘I
10