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I'll be fishing with circle hooks next year for catfish. I have 100s of feet of spring tempered SS wire and have been trying to come up with tons of uses for it.
One of the main problems with circle hooks is having the bait foul the hook by flipping around from the bottom and ending up closing the gap between the hook point and the shaft. Thus, I figured I could prevent that by making a bait keeping wire for the hook. This is what it looks like on a kahle hook I'm testing it out with.
The idea is that the wire will stab into the cut bait, that hangs below the bottom of the hook locking it into place, without causing problems with hooking the fish.