FM 23-45 Basic Field Manual
7
F
IGURE 3. — Tight head space adjustment.
F
IGURE 4. — Loose head space adjustment.
from the hand and possibly result in serious injury. To remove driving spring rod, place
protruding end of rod on the table or a, block of wood. With bolt firmly grasped by the
right hand (palm of the hand over face of bolt), press down and at the same time turn
bolt one-fourth turn to the left until lugs on rod leave their recess in bolt. Slowly
release pressure on bolt, allowing it to rise under the action of driving spring until
about 3 inches of rod protrude. With the left hand grasp protruding portion of rod and
spring; raise both hands and the bolt from the table, keeping rod and spring in their
same position relative to bolt. Separate rod and spring from bolt with a quick jerk. The
quick, separating jerk will not allow spring to kink. Separate driving spring rod and
driving spring.
