text: Insertion and Extraction Methods
  Figure 5-3. SPIES rope rigging on UH-60
  5-57. Once the team secures the SPIES rope and cargo straps, they secure the straps running across the
  deck of the helicopter. To do this takes eight snaplinks. The team spaces the snaplinks evenly across the
  deck, alternating from one side of the strap to the other, and from top and bottom. The first snaplink goes
  from the rear of the strap around the bottom two straps, and the next snaplink goes from the front of the
  cargo strap around the top two sections of the strap. This continues until the team establishes at least four
  points (Figure 5-4).
  Figure 5-4. Rigging of snap links.
  5-58. The 4-inch by 4-inch block of wood is taped down along the right edge of the doorway so the
  cargo strap crosses the block perpendicularly at the middle. The wood block serves as a chopping block
  pad in case of an emergency cutaway (Figure 5-5).