Complete
Teardown,
Cleaning,
and
Reassembly
of
the
Olympus
BH
‐
2
Sliding
Focus
Block
Revision
2
Page
11
of
23
Use
a
suitable
solvent
(e.g.,
acetone)
to
remove
any
grease
from
the
four
long
guide
rails
(see
Figure
19
)
and
from
the
side
grooves
in
the
arm
casting
(see
Figure
20
).
Figure
19
–
Clean
grease
from
the
guide
rails
Figure
20
–
Clean
grease
from
the
side
grooves
in
the
arm
Remove
and
Reinstall
the
Bottom
Dust
Cover
The
function
of
the
bottom
dust
cover,
which
is
not
present
on
all
BH
‐
2
stands,
is
to
prevent
dust
and
debris
from
entering
the
opening
at
the
bottom
of
the
arm
(where
the
arm
attaches
to
the
base
casting)
and
fouling
the
mechanism
of
the
sliding
focus
block.
Although
this
dust
cover,
if
present,
does
not
need
to
be
removed
to
perform
the
maintenance
described
in
this
document,
its
removal
may
be
desirable
to
allow
for
a
more
‐
thorough
cleaning
of
any
dust
and
debris
accumulation
in
the
area
of
the
dust
cover,
and
the
removal
procedure
is
included
in
this
document
for
the
sake
of
completeness.
Use
a
suitable
JIS
screwdriver
to
remove
the
two
M2x4
screws
securing
the
dust
cover
onto
the
bottom
of
the
arm
casting
(see
Figure
21
).
Lift
and
remove
the
dust
cover
(see
Figure
22
)
and
clean
any
dust
and
debris
from
the
cover
and
from
the
associated
area
of
the
arm
casting.
Reposition
the
dust
cover
in
place
and
secure
it
to
the
arm
casting
with
the
two
M2x4
screws.
Figure
21
–
Remove
screws
securing
bottom
dust
cover
Figure
22
–
Remove
the
bottom
dust
cover
Remove
the
Guide
Rails
from
the
Focus
Block
Remove
the
two
short
guide
rails
from
the
side
groove
in
the
focus
block
(see
Figure
23
).
Figure
23
–
Remove
two
guide
rails
from
the
focus
block
Use
a
suitable
solvent
(e.g.,
acetone)
to
remove
any
grease
from
two
short
guide
rails
(see
Figure
19
)
and
from
the
side
groove
in
the
focus
block
(see
Figure
24
).
