I did my research before digging holes to secure our new arbor into 2-foot deep holes. The old clam-shell digger? Please... WAY too much work for a hole that is either not very deep OR too wide. (I wanted a hole just big enough to seat the 4 x 4s that extended into the legs of the Arbor.) An mechanized auger? Well, great, if you have one, but expensive and a lot of trouble to rent.