What is the lowest power-requiring type of drill to use/ since it needs to be run on a 12 foot long extension-----. I tried a speed-bore type spade bit, but it has a bad habit of "catching" just as it breaks through - putting a severe strain on the connection between the bit and the extension.
Would a forstner type work better? Or an auger?
Still looking for a viable bit extender setup as well - thinking I might need to go to 1/2" steel waterpipe with a 7/16 or 1/2" hex shaft welded into the one end for the chuck to grab. In 3 or 4 foot length with couplers it should be handleable?