I know not everyone will have access to the equipment needed to make this, but thought it may be of interest. I bought a unused axe head at a carboot sale for £1.00. I had an old bar of steel about 3/4" diam. and 4 feet long in the shed, and I welded the axe head on one end, so the blade was now the business end, ie. not fixed like an axe, but more like a spear. Why did I do This? I had some trees to remove, and thought that this would be a good way of cutting through roots as I dug the rootball out. The tool more than lived up to my expectations, and is easy to use. Sorry not to be able to show a photo.
Brian