For about $10 you get this sharpening stone. Great for hand tools, machetes, axes, shovels, mower blades, etc even knives. Simple circular motions is all it takes. Has a nice plastic cap to hold on to.
In my spare time I like sharpening things. This is a very handy, effective, simple to use item that cost's very little. Check out the Edge eater by Smith's. You can pick up or have your local hardware store order one for you. You will be glade you did.