Sorry mate, "Swinging the Lead" comes from the old sailing days where a sailor who was marking the depth with a knotted rope used to waste time swinging it and not dropping the lead to the bottom.
I'm not a pole fishing expert Nick, but I am sure those little dome shaped floats are called "bobbers".
I remember reading years ago of a guy who went to the States and took with him some insert waggler floats. He caught tremendous quantities of crappies using worms for bait.