Page 85 - Nate Fitch, Ron Funderburke "Climbing Knots"

Rappelling in this manner utilizes an extension of the
belay loop and an autoblock backup. Many incidents
in North American rappelling could have been averted
by this kind of setup.

autoblock can be quickly deconstructed and stowed for
future use. In the case of the lower and the rappel, it is
prudent to use a locking carabiner to attach the auto-
block to the belay loop, and a 5mm nylon loop is an
effective size and diameter for hitching to most climb-
ing ropes and static ropes.

72 CLIMBING: KNOTS