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The figure-of-8 block

1 Thread the figure-of-8.

2 Cross the rope (important: not doing so may result in the device being difficult to undo when loaded).

3 Pass a bight of rope up through the large ring

4 Pull the loop down and 5 pass it over the small ring.

6 Pull everything tight. To prevent people abseiling on the wrong end, a quick-draw could be clipped between the small ring of the figure-of-8 and the anchor (do not use an ordinary karabiner for this purpose – it will be difficult to undo under load).

A clove hitch and locking karabiner (top) and a stopper-knot crabbed to the live rope (bottom)

Non-releasable rigs

 a clove hitch and locking karabiner (see photo) (important: ensure that the knot lies away from the gate and that the gate is locked – a twist-lock karabiner is recommended here), and

 a stopper-knot crabbed to the live rope (see photo). This may be safer in the absence of a twist-lock karabiner, but the knot can be difficult to undo. Also, the rope can be more difficult to pull through from an oblique angle.