Used to determine the distance between two trains so that this distance can be transferred onto the bottom plate of a watch movement. The trains are inserted freely but without any clearance between the pins of the compass. The two parts of the instrument, fitted to a hinge, are then drawn together until the gears mesh normally. Once this distance is identified, it is transferred to the bottom plate of the watch movement by the outer tips of the pins. The value of this instrument is dependent upon the perfect alignment between the pins and the
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