The sides of most screwdriver blades tre tapered slightly toward the point. This is O. K. provided the blade does not have to reach into a hole for the screw—in that case grind off the tiper so that the blade is slightly wider at the extreme point

A small jeweler's screwdriver with revolving head should be on hand for removing the smallest sight screws, and the little all steel screwdrivers packed with Colt revolvers are also excellent. When making very small screwdrivers, use drill rod and shape the point as shown in Figure 3, using a rattail file for the purpose. This is the strongest possible shape for a small blade. When made of

Fig. 3

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