Chin Strap, Sealed Pull Pins and Swing Catch for Fiberglass Helmets

Updated the verbiage throughout, including to service sealed pull pins annually.

Added the pull pin overhaul and pull pin sleeve sections.

Updated layout.

Updated the cross references to the torque specs due to the splitting of APNDX into three separate modules.

Added the new note and important icons throughout the module. Added QR code to the instructional YouTube video and updated the, "Exploded view of the sealed pull pin" in section 1.2.3 Sealed Pull Pin Overhaul. Updated steps 2 in section 1.2.3.1 Preparation and the note in section 1.2.3.3 Reassembly and Filling.

Added section under 1.1 Chin Strap.

Updated layout.