My friend gave me a mighty mac chipper/shredder/mulcher. It has a electric motor on now. It can barely turn over. Originally, I think it came with a gas motor, but it is long gone. It is not very big, 3 feet tall by 3 feet long, with a open chute on top, for leaves and straw and a smaller chute on the side for chipping small brush. What is this good for? Is it worth anything? The metal blades on the shredder part look good, not bent or missing. The only blade for the chipper is shiny and sharp.