Screw Extractor
The Bullock Screw Extractor, shown in Fig. 279, is a simple yet very valuable accessory to the watchmaker, who finds he has a plate in which a screw has been broken off. To use this tool, first fasten it in your vice, then bring one end of broken or rusted-in screw against screw center and the broken screw head against screw driver; turn the washers so as to hold the broken screw firmly in place; turn the plate gently, and the broken screw will follow the screw driver point out of the plate. It may be necessary in some instances to turn the screw driver point against the broken head with a good deal of force in order to start the screw. A little benzine or kerosene applied to the screw will help to loosen it.