Figure 11. Jeweler's And Spark Plug Testing Screwdrivers

Use And Care Of Handtools And Measuring Tools
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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

also small.

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

page 22.

They are made by snap fastener manufacturers to fit only their

products.