What's the best way to rig up one of those worms? Do you thread the hook through it? How long of a dangling tail do you typically leave?

I did get a bite with one last weekend, but I wasn't sure if I had it rigged up correctly and the fish was only on for about 5 seconds. I had actually cut one in half ( I thought it was dangling too much whole) and threaded it through the shaft of my hook, drifting it with lead and no corky in a small fast river.

Any help is appreciated!