This very simple stopper knot, among other things, prevents a rope from “escaping” a pulley. In general, it’s advisable to tie this knot well above the end of the rope (at least 8 inches [20 cm] up).
STEP 1
Make a loop.
Pass the running end under the standing end, then through the loop. When going through the loop, first go through the top part and then through the bottom.
STEP 3
Pull the ends to tighten.