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An Alternate Method to Clear Adhesive from the Heads of the Setscrews
Introduction
Earlier in this document, a method was described
for using a solvent, such as acetone, to remove any
thread-locking adhesive that may be fouling the
heads of the setscrews that secure the pinion
assembly to the pillar arm casting of the
microscope stand. It is necessary to utilize some
method for softening and removing this adhesive,
since it is critical that the setscrew heads, which
are staked in place in the pillar arm casting with
thread-locking adhesive, be free of this adhesive
and any debris before loosening is attempted. This
adhesive makes the setscrews difficult to remove in
even the best of circumstances, and because of this
it is imperative that the Allen tool or driver that will
be used to remove the setscrews be fully seated in
the setscrew heads before torque is applied.
If you attempt to remove the setscrews when there
is adhesive in the setscrew heads (which prevents
the tip of the Allen tool or driver from fully
seating), the heads will be damaged if the
inadequately seated tool spins in the heads, and it
will then be extremely difficult, if not impossible, to
remove them without resorting to drilling them
out.
Although the acetone method described
earlier works well and is a good way to clear the
screw heads, an alternative procedure which uses
heat instead of acetone to clear the setscrew heads
is presented here, which can be used if acetone or
another suitable is not available.
Using Heat as an Alternative Removal Method
The only things needed to utilize heat to remove
the adhesive from the setscrew heads is a flame
source, such as matches, a lighter, or a butane
micro torch, and two 1.5mm Allen tools or drivers.
One of these 1.5mm drivers will be heated and
used to melt the adhesive from the heads of the
setscrews, whereas the other one will be used to
apply the necessary torque to loosen and remove
the setscrews once the adhesive has been
removed. It is important that two separate drivers
be used here, since the hardness of the driver that
gets heated may be impaired, and a softened tool
Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism
Appendix 2
is more likely to spin in the setscrew heads and
thereby damage the setscrews to the point where
their removal will be extremely difficult.
Removing the Adhesive with Heat
Use matches, a lighter, or a butane micro torch to
heat the tip of one of the two 1.5mm Allen tools or
drivers for 15-20 seconds. While the tip of the
driver is hot, insert the driver tip into one of the
setscrews heads to melt the adhesive in the hex
recess. Lightly tap the driver to seat the tool as
deeply as possible, then remove the heated tool
and clean any visible adhesive from the tool tip.
Repeat this process as many times as necessary
until the tip of the tool seats fully in the first
setscrew, and then repeat the same procedure for
the remaining setscrew. After all the offending
adhesive has been removed from the hex recesses
of the two setscrews, discard this driver or mark it
in such a way that it will never again be used to
apply torque to setscrews.
which this tool should ever be used in the future is
clearing adhesive from other setscrews, since the
hardness of its steel tip may have been impaired by
the application of heat.
Removing the Setscrews
Once the setscrew heads have been cleared of
adhesive, and before attempting to loosen the
setscrews, use a heat gun to thoroughly heat both
setscrews and the surrounding areas of the pillar
arm casting to soften the adhesive staking the
setscrews in place. It takes quite a bit of heat to
loosen the thread-locking adhesive this on these
setscrews, since there is a lot of thermal mass in
the pillar arm casting. Once both setscrews have
been thoroughly heated, use a 1.5mm Allen tool or
driver to loosen to remove the two M3X5 hex-head
setscrews. Note that if the fit of the 1.5mm Allen
driver feels at all loose in the heads of the
setscrews, try inserting a 1/16" driver instead into
the setscrews, since it is slightly larger and will
therefore be less prone to slippage, but only use
the 1/16" driver if you are sure that it seats fully
into the setscrew heads.
The only thing for
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