21
Chapter 2: Helmet Preparation and Operation
NOTE:
Before drilling full-size holes in the
helmet shell, it is advisable to drill pilot holes
with a #52 (0.0625") drill bit.
6. Referring to
, use a drill with a #20
(0.161") bit to drill both upper holes marked in
Step 5.
7. Referring to
, attach the kit as
follows:
a. On one side of the helmet, align the anti-
snag spacer over the holes, ensuring all
three holes line up.
b. Align the bayonet receiver over the anti-
snag spacer, ensuring that the four rivets in
the bayonet receiver are seated within the
four holes in the spacer.
c. From inside the helmet, attach the
bayonet receiver and the spacer using the
backplate, washers, and MS51957-30B
screws. Ensure that the edgeroll is trimmed
or pushed back so that the backplate will lie
flush against the inside of the helmet.
d. Install the MS51957-27B screw and washer
into the anti-snag spacer where the hole
was drilled in Step 4. Tighten the screw to
no more than 60 inch-ounces of torque.
Ensure that each screw is rotated at least
three turns so that it is properly engaged in
the bayonet receiver.
e. Repeat Steps a-d on the other side of the
helmet.
(Continued on next page)
Figure 2-26. Drilling Marked Hole
Figure 2-27. Attachment of Kit
When drilling, position your hands away from the drill bit to avoid injury
When drilling, hold the drill perpendicular to the helmet to prevent damage.
CAUTION
Hole to drill
Bayonet
receiver
Anti-snag
spacer
Washer
Washer*
Screw, MS51957-27B
Backing plate
Screw, MS51957-30*
*NOTE: For clarity, only one screw
and washer are shown for the
bayonet receiver assembly.
There are actually two.
