Just built myself a screw type log splitter to go on my fergie (hydraulics won't deal with anything else!). Not as scary as they appear, light pressure on the log to start it on the thread then you can let go! I've mounted it on a steel plate, so the log can't rotate and there's no chance of catching you leg on it. Cost £120 for screw, shaft and bearings kit, £55 for the A-frame and around £50 for the angle iron and plate.