I was advised by helpful posters that I could probably just cut up a pewter tankard and drop hunks in for tin when I melt up a pot of lead. All fine and well. However, I also have a platter that weighs almost 6 pounds and is 1/8 to 1/4 inch thick that I would rather cut up than smelt. Will a pair of snips do this? What is the best tool for this called?