I demonstrate how to make a biner block backed up by a figure eight on a bight for a single rope rappel....and then I do the rappel.
I need to add that I rigged this as if I were doing a long single rope rappel which would use all of the rope with the block and that the tail section would be used to tie another rope (or pull cord) to for the pull.
WARNING: This video is a demonstration of tying a clove hitch to create a biner block for a single rope rappel and the video should not be used in lieu of proper instruction/training. You are responsible for your own safety!
