How to tie a big fish rig

This is a rig I came up with before fishing for big catfish. I've only used it once but it works better than anything else i've tried.

Step 1: Materials

For this rig, you will need...
A circle hook (size 4/0)
a 1/2 or 1 oz. dipsy swivel sinker
a barrel swivel (size 5)
a treble hook (size 2/0 or 3/0
a reel with 20 lb line
a spool of 17 lb line