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I've never heard of butterworms until now so I just googled them. They appear to be a bigger version of the waxworms I buy at the petstore feed my pet fish.
Sunnies are pretty stupid and will hit anything small object that wiggles in or on the water. All the plastic manufacturers make panfish and trout sized scented plastics that work fine for sunfish. I think using live bait on sunfish is working too hard.
The secret is to make it move in such a way that fish attack it.
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