Questions for those of you who use hand augers.... It looks like the biggest bit you can get for a hand auger is a 12". Does anyone know of a machine that can handle a bigger bit? For planting trees with a large (24" or 36") root ball can you use a hand auger and just drill several holes to make one larger hole? Is this easy to do? How long would it take to dig a hole big enough to plant a 36" root ball? Thanks for your help.