TM 1-1500-204-23-9
Figure 4-18. Using Offset Ratchet Screwdriver
(a)
Select the correct style and tip size for the
screw being used.
(b)
Insert the tip in the screw slot.
(c)
In tight places, alternate tips to complete
screw installation.
(4)
Use of offset-ratchet screwdriver. An offset-
rachet screwdriver is used as follows: (see figure 4-18).
(a)
Select the correct style and tip size for the
screw being used.
(b)
Set the action selection lever in the
screwdriver for the direction of rotation required.
(c)
Insert the tip in the screw slot of the screw
head. Pull the lever to the right or left, depending on
whether the screw is being installed or removed. The tip
does not have to be removed from the screw slot.
d.
Repair. Battered or nicked blades may be
repaired by grinding to the original shape.
(1)
Common screwdrivers. When grinding common
screwdrivers, the tip should be squared and the sides
parallel, as shown in figure 4-19.
(2)
Cross-point screwdrivers. Phillips screwdrivers
require special holding fixtures for grinding but can be
shaped in an emergency by filing if the original angles
and bevels are maintained.
NOTE
Dip the screwdriver in water often during
the grinding process to preserve the
temper.
(3)
Restoring temper. When the tempered portion
of the blade has been broken off, ground away, or
overheated, the temper can be restored by the following
process:
(a)
Heat about 1 1/2 inches of the blade to a
cherry-red color.
(b)
Dip 3/4 inch of the tip into clean, cold
water and quickly rub the hardened end with abrasive
cloth, Federal Specification P-C-451, to brighten it.
(c)
When a light blue color reaches the tip,
quench the screwdriver in water.
(d)
Polish the blade with abrasive cloth,
Federal Specification P-C-451.
e.
Care. Observe the following practices for the
care and upkeep of screwdrivers:
(1)
Do not expose a screwdriver to excessive
heat, because it may reduce the hardness of the blade.
(2)
Replace a screwdriver that has a worn or
damaged handle or a rounded tip.
Figure 4-19. Screwdriver Tip Grinding
4-7
