A convenient drill holder that may be fitted to an ordinary carpenter's boring brace can be made as follows: Take a piece of soft steel about two inches long. File it tapered to fit the brace. Bore a hole in the larger end to a convenient depth and to size of drill to be held. File slot in side and to the center of the holder as shown, with the front edge of the slot flush with the end of the drill hole. Grind the end of drill flat at one side as far as the center, so that when the drill is placed in the holder the flattened end will project beyond the drilled hole and engage the bottom of the slot. With this device broken shank drills may be utilized to advantage.

Fig. 104 - Holder for broken shank drills..