Fig. 2415.
The faces of the link having been set, the width of the link slot must be set, for it may open or close in places. If it opens it may be closed by the jaws of a powerful vice, while if it closes it may be opened by a pair of inverted keys, inserted as shown in [Fig. 2415], and driven in by the hammer. At each trial, however, a mark should be made on the driven key, so that it may be known how far to drive it at the next trial.
Fig. 2416.
Fig. 2417.
[Fig. 2416] represents a link that is supposed to have been case-hardened, and to therefore require resetting. The stem from a to b should first be straightened to a straight-edge on both its side and edge faces. It should then be tested for winding with the winding strips, c, d, placed as in [Fig. 2416], and then as in [Fig. 2417].