Crown Chuck
A chuck for holding watch crowns while undergoing repairs of various kinds. Figure 73 illustrates the Dale chuck, which is made on the lines of the ordinary split wire chuck, a large recess being turned in the end for the reception of the crown. The draw-in of the chuck holds the crown firmly in place. Fig. 74 illustrate the Johanson chuck, which is intended to hold all sizes of crowns, from the smallest to the largest. The figure clearly shows the adjustment of parts. This chuck is manufactured in two styles, one like Fig. 74, which is ready to insert into a number 40 wire chuck of an American lathe, while the other style is mounted on a regular chuck and is always ready to insert into the lathe head, the same as an ordinary split chuck.