Trev taught me this years ago.
Whenever we check fence lines we take a nail with us.
It's quick, easy, doesn't use materials other than the fence itself and even better. It works.
If you have two rolls of chook wire you want to combine you can quickly 'knit' them together.
Or, take one fence with a hole in it.
Place a nail between two wires, one from each row of chook wire.
Spin the nail around 360 degrees 2 or 3 times.
Pull out the nail.
It's such an easy, simple trick, had to share it :-)