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Hello; Practical problem here; I need a 25 cm (10 inch) diameter hole in the ground, more than a meter deep. Now I don't have one, and I can't buy one (lockdown & self-isolating). But I have a LOT of iron and steel and a lot of tooling to manipulate them. I know of three types; First is the typical "auger" style thing; resembling a helical drill, often made by round things welded to a central round thing. Then there is the 2 bar type, which twists at the tip. Then there's the pipe style thing with dirt-scooping points below (this one is often quoted for rocky soil). Now I don't have rocky soil; but I do have LOTS of roots, as I basically live in a forest. I also have 25 cm diameter diving bottles which I can cut up; which would make the last option probably the quickest. What do you recommend ? anyone know any "hack" to make the helical flights for a soil drill ? greets, bart