Pfaff 130-6 - 12. To take apart and clean the hook

to
remove
the
upper
and
lower
parts
of
the
bobbin
case.
Turn
the
balance
wheel
so
as
to
see
clearly
screws
EI,
E-2,
and
E-3.
Unscrew
these,
and
take
off
the
hook
bow.
NOTE:
Since
these
screws
are
extremely
small,
it
is
necessary
to
use
great
care
so
as
not
to
lose
them.
Grasp
center
hook
between
thumb
and
forefinger,
and
turn
the
balance
wheel
gently
until
the
lower
case
slips
out.
Clear
out
the
dirt
with
a
cloth,
and
put
a
drop
of
oil
on
the
running
surface
under
the
case.
Replace
lower
bobbin
case.
Do
not
force
it,
as
It
will
damage
the
part.
Replace
the
hook
bow,
and
screw
the
three
screws
back
Fig.
13
16