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Hair Spring Stud Index

Wathier's Self-adjusting Hair Spring Stud Index, shown in Fig. 158, is a very useful device, and by its use the watchmaker can save much time and can obtain better results than by following the regular methods of determining Place the lower part of balance staff in round cleat A. Turn balance until ruby pin comes over oblong hole at B. Now let the balance down until roller table rests on steel center plate. The balance will then be ready for the spring. Place the hair spring on the staff, with the stud in exact line with the line on the index corresponding in name with the movement you wish to put in beat. Now fasten the hair spring collet on the staff, and you will find movement in beat. At a glance, the watchmaker may be lead to believe that this tool is only applicable to the fourteen movements shown on the index, but in reality it serves for almost every movement that comes into the hands of the repairer. For example, the line marked E. Howard & Co., not only serves for that make of watches, but also for Waltham 14 and 16 sizes. Directions accompany each tool.

Fig. 159 shows a hair spring stud index recently placed on the market by A. W.