but
the
primary
cause
is
a
misalignmen
t
b etw
een
the
center
axis
of
the
plug
and
the
axis
on
whic
h
the
holes
were
drilled.
See
gure
6.2.
If
the
axis
of
the
pin
holes
is
sk
ew
ed
from
the
cen
ter
line
of
the
plug,
then
the
pins
will
set
from
bac
k
to
front
if
the
plug
is
turned
one
wa
y
,
and
from
front
to
back
if
the
plug
is
turned
the
other
w
a
y
.
Many
lo cks
hav
e
this
defect.
Scrubbing
is
fast
b ecause
you
don't
need
to
pay
attention
to
individual
pins.
Y
ou
only
need
to
nd
the
correct
torque
and
pressure.
Figure
6.1
summarizes
the
steps
of
pic
king
a
lo ck
by
scrubbing.
The
exercises
will
teach
you
ho
w
to
recognize
when
a
pin
is
set
and
ho
w
17
Figure
6.1:
Driver
pin
catches
on
plug
to
apply
the
correct
forces.
If
a
lo ck
do esn't
op
en
quic
kly
,
then
it
probably
has
one
of
the
characteristics
describ ed
in
c
hapter
9
and
you
will
hav
e
to
concentrate
on
individual
pins.
18
Figure
6.2:
Alignment
of
plug
holes
19
1.
Insert
the
pick
and
torque
wrenc
h.
Without
applying
any
torque
pull
the
pick
out
to
get
a
feel
for
the
stiness
of
the
lo ck's
springs.
2.
Apply
a
light
torque.
Insert
the
pick
without
touc
hing
the
pins.
As
y
ou
pull
the
pick
out,
apply
pressure
to
the
pins.
The
pressure
should
b e
sligh
tly
larger
than
the
minimum
necessary
to
ov
ercome
the
spring
force.
3.
Gradually
increase
the
torque
with
each
stroke
of
the
pic
k
un
til
pins
b egin
to
set.
4.
Keeping
the
torque
xed,
scrub
bac
k
and
forth
ov
er
the
pins
that
hav
e
not
set.
If
additional
pins
do
not
set,
release
the
torque
and
start
ov
er
with
the
torque
found
in
the
last
step.
5.
Once
the
ma
jorit
y
of
the
pins
ha
v
e
b een
set,
increase
the
torque
and
scrub
the
pins
with
a
sligh
tly
larger
pressure.
This
will
set
any
pins
whic
h
ha
v
e
set
low
due
to
b eveled
edges,
etc.
T
able
6.1:
Figure
13:
Basic
scrubbing.
20