TM 1-420
chillne a concentric bearing surface on the work at the point at which
the jaws are to be applied. After the work has been mounted and the
center rest clamped firmly to the lathe bed, the jaws must be carefully
adjusted to this surface and locked in position by means of the attached
set screws.
FI(.:Un- : AP.-Application of chuck(el d mandl'el.

FIGURE 32.-Application of center rest.

United States. Army. Air Corps. Lathes. Washington, D.C.. UNT Digital Library. Accessed August 30, 2016.