In an emergency the writer made a drill driver as follows: A piece of 3/16-inch square brass wire about 10 inches long was slit at one end with a hack saw, as at 2. The opposite end was filed to a blunt point 3. About 1/2 inch from this end a round section 4 was filed. From a piece of sheet brass a swivel 5 and the slide 6 were formed. The swivel was made with a socket 7 to receive the point. Notches 8 were filed to tit the round section. The slide was formed with a square hole to fit loosely on the wire. The lugs of the slide were slightly concaved, as shown. By holding one end of the wire in a vise and gripping the other with a wrench, the wire was twisted. A ring and wedge, as illustrated, formed an effective grip for the drill. A more practical grip might be made, as shown at 10. The two ends of this ring should be soldered. A slot might be filed in opposite sides of the twisted wire to receive the ring and prevent it from dropping off. This driver has done good service for nearly two years.

Fig. 106 - Driver for small drills.