My reasoning for the three way is to be able to attach a sinker that is tied to a snap that can clip onto the swivel. The line would be of lesser strength than the main line and leader in case of a snag. I thought the cannon ball was a better alternative than the bank sinker. In fact you might be able to have a snap at both ends and swap out to a heavier weight as the current increases. The egg sinker would require cutting the line each time, requiring more of an effort.
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