This is a Stopper Hitch. It is a knot that applies pressure. Pressure that increases with the weight you apply to it. Used most often in two situations: 1. attaching sand bags to ropes and 2. tying a counter weight line to the locking rail to indicate that the line is to stay put.
![stopp1 stopp1](http://hstech.org/wp-content/uploads/rigging/stopp1.jpg)
The smaller line gets one wrap around the big line.
![stopp2 stopp2](http://hstech.org/wp-content/uploads/rigging/stopp2.jpg)
Then it passes over itself.
![stopp3 stopp3](http://hstech.org/wp-content/uploads/rigging/stopp3.jpg)
Under the big line again.
![stopp4 stopp4](http://hstech.org/wp-content/uploads/rigging/stopp4.jpg)
Then in between itself and the big line several times. 4 is a good number. I hope the riggers out there will let us know if there is a standard number of wraps.
![stopp5 stopp5](http://hstech.org/wp-content/uploads/rigging/stopp5.jpg)
I used 4 wraps. Notice how the small line keeps wrapping inside itself.
![stopp6 stopp6](http://hstech.org/wp-content/uploads/rigging/stopp6.jpg)
Pull it tight.
![stopp7 stopp7](http://hstech.org/wp-content/uploads/rigging/stopp7.jpg)
The small line is tied to the locking rail below.
![stopper8 stopper8](http://hstech.org/wp-content/uploads/rigging/stopper8.jpg)
This knot will allow itself to be adjusted simply by relieving the pressure. Without the pressure, the knot slides up and down with ease.
![stopp9 stopp9](http://hstech.org/wp-content/uploads/rigging/stopp9.jpg)