USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 1
JEWELER'S AND SPARK PLUG TESTING SCREWDRIVERS.
(10) Spark Plug Testing Screwdriver.
A neon tube, inserted in an
electric shock proof handle of a common screwdriver, indicates the condition
of a spark plug by the type of flash.
A brilliant flash means good
condition, a thin flash indicates too narrow a gap, and no flash means a
short. This screwdriver is equipped with a 2 1/4 inch blade and a pocket
clip (figure 11).
(11) Flexible Screwdriver.
A flexible screwdriver (not illustrated)
is available. It has a 1/4 inch wide tip and an overall length of 7 1/2
inches. The spring steel blade is flexible, enabling the user to get around
flanges, shoulders, and other parts to drive and remove screws.
(12) Radio and Pocket Screwdrivers.
A radio screwdriver (not
illustrated) has a round blade that is 1 1/2 inches long. The tip is 1/8
inch wide and the overall length is 3 1/4 inches.
Its use is in the
construction of radio chassis. The pocket screwdriver (not illustrated) is
It has a square blade that is 1 3/4 inches long, a 1/4 inch
wide tip, and an overall length of 4 inches.
It is similar to the close
quarter screwdriver shown in figure 8 page 23.
(13) Snap Fastener Screwdriver.
A snap fastener screwdriver (not
illustrated) is similar to the standard screwdriver shown in figure 7 on
They are made by snap fastener manufacturers to fit only their