text: Chapter 5
  Figure 5-5. Rigging of wood block.
  5-59. Once the cargo strap and wood block are secured, the excess cargo strap is gathered on the
  opposite side of the wood block and taped to the floor of the aircraft (Figure 5-6).
  Figure 5-6. Excess cargo straps secured.
  5-60. The sling rope is then tied to the SPIES rope by a Prusik knot about 2 to 3 feet below the cargo
  hook (Figure 5-7). A bowline knot with a half hitch is then tied to the running end and the ninth snap link
  is inserted and connected to a cargo ring in the middle of the aircraft floor. This line serves as a recovery
  line for the rope so that the aircrew can retrieve the rope into the aircraft. The recovery rope should be long
  enough so the weight on the SPIES rope is hanging from the cargo hook and not the recovery rope.