I made one once out of a jack Shaft hanger from a reel type power mower. Had one end welded up by my friend in his dad's shop, had an oil hole just the precise distance of the fuse in an m-80. Stuffed the m-80 down the "bore", fuse popped out the hole. Filled it full of anything I could find. We had a Cherry tree stump on our lack lot corner about waist high, I nailed the "Cannon" down on the stump. unfortunately, it was pointed at my neighbor's garage... Not thinking that it would go 50 feet, I touched her off....blew a softball size hole in the garage and darn near went out the other side left a lot of marks on that side and cracked wood. Needless to say I had to repair the garage and dispose of my cannon.