Figure 18.
For holding screws without damaging the heads use a pair of false jaws made of cast brass, like those shown in [Fig. 19]. The heads being held in the indentations formed along the upper edges of the fixture. For holding rods or small square pieces without injury a similar pair of false jaws are made which are shown in [Fig. 20].
Figure 19.
Figure 20.
For holding articles that are tapering a fixture is required like that given in [Fig. 21]. The yoke clasps the neck of the vise, and is held in place by a set-screw. The upright pin is received in the yoke by turning on a screw cut for the purpose, and by turning this up or down, the triangular piece at the upper part is made to accommodate itself to the height of the vise. The back angular corner of this piece has a bearing against the jaw of the vise, and the opening made between the other jaw of the vise and the front of this angular piece will be the same as the piece of work that is held between the two.
Figure 21.