open position. To remove the crank from either projector, unscrew
the screw in the head of the crankshaft. Pull the crank out of its
mounting hole in the role attachment, and catch the rotatable pivot,
tension spring, and two washers as they fall free. To replace the
crank, slide the crankshaft into the mounting hole on the roll attach-
ment. Then slide the tension spring, the large washer, the pivot,
and the small washer on the shaft, and replace the screw in the head
of the shaft.
56. Projection-Head Assembly
a. Window. Remove the two screws that hold the window frame
to the bottom of the mirror housing. Then hold the window frame
in place, and remove the screw that holds the frame to the top of the
housing. Lift the window and frame carefully off the housing. To
remove the window, remove the strips of tape that hold it to the
frame. To replace the window a n d t h e w i n d o w f r a m e , t a p e t h e
window in place on the inside of the frame, set the frame back on the
mirror housing, and replace the three screws.
b. Front Surface Mirror and Mirror Support.
(1) First remove the window (a above).
(2) Remove the two screws and spring clips that hold the mirror
to the top of the mirror support. While removing the screws,
hold the mirror in position. Hold a chamois or clean, lint-
free cloth between the hand and the mirror so that the mirror
will not be spotted.
(3) Slide the mirror out of the groove in which it rests at the
bottom of the support.
Caution: Handle the mirror carefully. The reflecting
surface of the mirror is coated, and the coating is not pro-
tected. Clean the mirror only when absolutely necessary.
(4) Unscrew and window the elevation screw by turning the ele-
vation knob counterclockwise. Remove the two screws that
hold the support to the rear of the mirror housing. Hold
the support while removing the screws, and then remove it
from the housing.
(5) To replace the mirror support and mirror, reverse the dis-
assembly instructions ((1) through (4) above). When the
elevation knob is replaced, be sure it is screwed into the back
of the mirror support far enough so that the projected image
will be approximately centered.
c. Lens (fig. 33). The lens
by a split ring and
locking screw. To remove the lens, proceed as follows:
(1) Loosen the two front screws in the support arm flange around
the upper part of the lens.