as alot of you know Im new to the river fishing scene. I have a few questions about sinkers for you master catfishers. 1. what type (shape) are the best sinker for medium/heavy current. 2.how big should they be? 3.exactly how do I make a carolina rig? 4.what are tire weights?? I am going to buy a sinker mold and have heard that tire weights are good and cheap or free. are they something I can get at a junkyard? 5.hahaha you guys are great and I look foward to any and all advice.