Complete
Teardown,
Cleaning,
and
Reassembly
of
the
Olympus
BH
‐
2
Sliding
Focus
Block
Revision
2
Page
16
of
23
After
the
four
cylindrical
rollers
have
been
pushed
into
the
channel
formed
by
the
four
guide
rails,
continue
pushing
the
plastic
spacer
rod
into
the
opening
until
just
the
tip
is
visible
(see
Figure
46
).
Figure
46
–
Push
the
spacer
rod
into
guide
‐
rail
channel
IF
GREASE
IS
TO
BE
USED
IN
THE
SLIDING
FOCUS
BLOCK
(RECOMMENDED):
Lightly
coat
the
remaining
four
cylindrical
rollers
with
a
suitable
grease
(item
5
or
7
of
Appendix
2
).
Place
these
four
greased
cylindrical
rollers
onto
the
greased
guide
rails
in
the
side
channel
of
the
guide
block
protruding
from
the
bottom
of
the
arm
(see
Figure
47
,
shown
without
grease
for
clarity).
Orient
the
rollers
as
shown.
IF
GREASE
IS
NOT
TO
BE
USED
IN
THE
SLIDING
FOCUS
BLOCK:
Place
the
four
remaining
cylindrical
rollers
onto
the
guide
rails
in
the
side
channel
of
the
guide
block
protruding
from
the
bottom
of
the
arm
(see
Figure
47
).
Orient
the
rollers
as
shown.
Figure
47
–
Place
remaining
rollers
onto
upper
guide
rails
Carefully
push
the
protruding
guide
block
(with
the
cylindrical
rollers
and
spacer
rod
sitting
on
top
of
the
guide
rails)
into
position
behind
the
focus
block,
making
sure
that
the
rollers
do
not
come
out
of
position
on
the
guide
rails
as
they
are
pushed
into
the
channel.
Align
the
three
holes
in
the
focus
block
with
the
tapped
holes
in
the
guide
block
(see
Figure
48
).
Figure
48
–
Push
guide
block
and
rollers
into
the
channel
Mount
the
Guide
Block
into
Position
Hold
the
guide
block
in
position
such
that
the
three
holes
in
the
focus
block
are
aligned
with
the
tapped
holes
in
the
guide
block.
Make
sure
that
the
brass
shims
are
not
visible
through
the
three
holes
in
the
focus
block,
otherwise
the
screws
may
damage
these
shims
when
they
are
reinstalled
(if
necessary,
use
a
toothpick
or
some
other
pointed
tool
to
reposition
the
shims
so
that
the
screws
will
not
damage
the
shims
when
they
are
reinstalled).
While
holding
the
guide
block
in
this
position,
use
a
2.5mm
Allen
wrench
or
driver
to
reinstall
three
M3x12
hex,
socket
‐
head
cap
screws
to
secure
the
guide
block
to
the
focus
block
(see
Figure
49
).
Initially,
snug
these
three
screws
slightly,
then
back
them
off
approximately
one
‐
half
turn
to
allow
the
guide
block
to
float
relative
to
the
focus
block.
This
float
will
allow
the
wedge
nuts
to
move
the
sliding
focus
block,
as
the
tension
screws
are
tightened
to
eliminate
the
lateral
play
in
the
slide.
Figure
49
–
Reinstall
screws
to
secure
the
guide
block
Adjust
for
No
Lateral
Play
in
the
Sliding
Focus
Block
Use
a
2.5mm
Allen
wrench
or
driver
to
snug
the
two
M3x16
hex,
socket
‐
head
cap
screws
to
tighten
the
wedge
nuts
(and
thereby
move
the
guide
block)
such
