VISE JAWS
The vise jaws, between which the line is justified, regulates the position of the face of the type on each end of the slug. The mold liner regulates the length of the slug. The vise jaws should be adjusted to have the face of the type flush with each end of the slug.
The short, or right-hand, jaw is adjusted by the adjusting screw in the knife block, under the right-hand vise locking pin. When the line is being justified, the matrix on the right-hand end is forced against the face of the short jaw. The matrix on the left is forced against the face of the long, or left-hand, jaw which is held tight by the vise closing screw on the older models, or the vise closing wedge on the newer models.
When it is desired to change the measure to be set, adjust the left-hand jaw with the adjusting rod. One-half em is the shortest distance the long jaw can be adjusted with the rod. If it is necessary to adjust less than this distance use the adjusting bushing which screws in the bracket. This applies to machines that are equipped with the vise closing wedge.
On the older models, remove the screw that passes through the vise closing screw arm and screws into the adjusting flange. Then adjust the vise closing screws, which move the nut in or out.