I have never used tire weights to pour any jigheads. I have a friend that would use them to pour bottom sinkers though... What I did was talked to a local roofing contractor about the excess lead they cut off of the lead jackets above the vent pipes when they do new roofs, most housed down here have three or four vents on them so it dont take long to get a good mess of lead. I haven't talked to him in a few weeks but last time I did he told me that he had about 75 pounds of lead for me at his house.

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You cain't fish with a hung line!