Simpson R3 - Manual (Page 2)

2
Attaching the Helmet D-Ring
The R3 Head and Neck Restraint comes with all of the parts to attach the D-rings to the helmet.
Supplied are: (2) 10-32 ½” screws (2) Nut-Washers and (2) D-rings.
To locate the D-rings:
Find the center of the helmet by:
1) Place a piece of masking
tape at the center of the rear
of the helmet. (estimate)
2) Mark the center of the
tape 1.5” above the bottom
of the helmet.
3) Measure from the helmet visor screw to the marked cen-
terline on the right side of the helmet.
3a) Mark the left side of the helmet by using the measure-
ment found in step 3 for the right side. Measure from the
left side visor pivot point to the mark in the rear of the
helmet. At the same distance as on the right side, mark
on the tape on the rear of the helmet vertically, 1.5”
above the bottom ridge of the helmet.
4) You should have two marks on the tape on the back of the hel-
met. Measure the distance between the two marks. The center
of the two measurements is the center of the helmet.
5) Measure from the new centerline around the helmet 6”. Mark
this spot 1.5” above the bottom of the helmet. Repeat the proce-
dure on the opposite side of the helmet.