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It
is
necessary
to
adjust
the
thread
tension
for
the
seams
shown
below.
[ADJUSTING
THE
NEEDLE
THREAD
TENSIONS]
The
left
needle
thread
tension
is
too
loose.
The
right
needle
thread
tension
is
too
loose.
[ADJUSTING
THE
LOOPER
THREAD
TENSIONS]
The
lower
looper
thread
is
tight
and/or
the
upper
looper
thread
is
loose.
The
upper
looper
thread
is
tight
and/or
the
lower
looper
thread
is
loose.
Tighten
the
left
needle
thread
tension.
Tighten
the
right
needle
thread
tension.
Loosen
the
lower
looper
thread
ten
sion
and/or
tighten
the
upper
looper
thread
tension.
Loosen
the
upper
looper
thread
ten
sion
and/or
tighten
the
lower
looper
thread
tension,
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