Racal Instruments 1994 Service Manual page 47

c.
With
the help of a second
person, position the instrument
between
the
fully
extended
rails.
For full-depth instruments, the rear
alignment-
block
hole
should
be
situated immediately
behind
the
fourth
attachment
hole
in
the center-rail. For immediate-depth
instruments,
the
rear
alignment-block
hole should be
located behind
the third
attachment
hole
NOTE:
For 3-1/2 inch high instruments, position the
rail
access
hole over the
top
alignment-block
hole;
for
5-1/4 inch high instruments, use the
bottom
hole.
d. Insert a
phillips
panhead
self
-tapping #8-32 x 5/16
screw through
the
rail
access
hole
and screw
it
to pull-up position
in
the
alignment
block.
At
the
same
time, position the
flange-mount angle-bracket
in
its
approximate
final
location
in
the
side
frame
channels. Align the
other alignment-block screw
holes with
their
attachment
holes
in
the
instrument-rail.
Insert phillips panhead
self-tapping
#8-32 x 5/16
screws
in
the
alignment blocks
and
fasten
to pull-up position.
Repeat
this
procedure
for
the other
rail
e.
Slide the handle/corner
insert
between
the side frames and each
angle
bracket
f.
Align the handle/corner
insert
and
angle-bracket
holes with
their
retaining
screw
holes
in
the side
frame
g.
Insert
two
phillips flathead
#8-32
x
1/2
screws
through
the
handle/corner
insert and angle-bracket
combinations, then fasten
firmly
to the
frame
h.
Securely
fasten
all
self-tapping screws
in
the instrument-rail.
The
instrument
should
slide freely on the
rails