I use split shot all the time. I set it about 18" above teh hook. This separation gives the minnow freedom to travel and do its job, attract fish. If it just hangs there because its not strong enough to move the weighted lure, your wasting bait. The other benefit is the fish don't feel teh weight of the jig. Less likely to spit it out because its unnaturally heavy. The split shot also makes the bobber neutrally buoyant. Slightest tug on the line and the bobber goes down.
HOI Crappie Club
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Quick, someone teach me how to fish so I can win this tournament!!!