n
•
.V
"t
Photo
6
After
oiling the hook,
sew
a
few
butfonlioles on a
rag
until there
are
no
traces
of
oil
left
on
the
material.
Special attention should be
paid
to oiling the slide collar x, on tripping
rod w so as to ensure reliable engaging and disengaging of the buttonhole
knife.
It cannot be emphasized enough
that
it is very important to remove the
accumulations
of
lint
with
a
brush
several
times
a
day
and
thus to
ensure
proper operation of the hook and the bobbin thread trimmer. This daily
cleoning and oiling witl increase the service life
and
the dependability of
the
hook
considerably.
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