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1. Introduction

relevant safety data sheet (MSDS or SDS) before using

any unfamiliar solvents. Many of the solvents listed

above are flammable, and their vapors may represent

an explosion hazard if mishandled. Whichever solvents

are chosen, be sure to follow all manufacturer's

instructions and safety precautions.

Solvent Compatibility with Parts and Finishes

Many solvents will damage the finish of painted

surfaces or will dissolve or damage plastic parts.

Isopropyl alcohol or 409 Cleaner may be safely used to

clean most painted and plastic surfaces. Do not allow

untested solvents to contact the paint or the various

plastic parts, to prevent damage. Before using any

solvent to clean plastic parts, test a small amount of the

solvent in an inconspicuous area of the part (such as

inside a knob) to ensure compatibility with the plastic.

Never use xylene to clean nylon parts, as xylene

dissolves nylon. Isopropyl alcohol and trichloroethylene

will cause swelling of nylon due to solvent absorption.

The list of solvents generally considered safe for nylon

includes acetone, diethyl ether, heptane, mineral

spirits, naphthalene, and turpentine.

Viewing Head Locking Screw

The locking thumbscrew for the viewing head on the

BHS/BHT stands differs from that used on the

BHSU/BHTU stands. The BHS/BHT locking thumbscrew

includes a spring-loaded plunger and consists of six

separate parts. This locking screw can be identified by

the presence of the slotted end-screw in the knurled

outer barrel of the thumbscrew (see

type of locking screw can be difficult to turn, and the

spring-loaded plunger can be stiff or sluggish, due to the

presence of old grease and contaminants in the mating

threads and in the plunger mechanism of the locking

screw.

Figure 2 – The viewing head locking screw (BHS/BHT)

Teardown, Cleaning, and Reassembly of the Miscellaneous Parts of the Olympus BH-2 Microscope Frames

Figure

2). This

In comparison, the locking thumbscrew on the

BHSU/BHTU stands does not have the spring-loaded

plunger and consists of just two parts. This locking

thumbscrew can be identified by the lack of the slotted

end-screw (see

Figure

3). This type of locking screw can

also be difficult to turn due to the presence of old

grease and contaminants in the mating threads of the

locking screw.

Figure 3 – The viewing head locking screw (BHSU/BHTU)

Servicing the Viewing Head Locking Screw (BHS/BHT)

To restore proper freedom of motion to a stiff BHS/BHT

locking thumbscrew, the locking thumbscrew must be

completely disassembled so that any thick or hardened

grease can be thoroughly removed, and then

reassembled with fresh grease per the following

procedure.

Disassemble the Locking Screw (BHS/BHT)

To disassemble the spring-loaded BHS/BHT locking

thumbscrew, grasp the knurled portion of the outer

barrel of the thumbscrew with soft-jaw pliers, to hold it

stationary (see

Figure

4).

Figure 4 – Hold the threaded outer barrel stationary

Revision 1

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