That is why cement is useless, whereas lime does not deteriorate even in thousands of years.I really like that machine! Nice and simple and cheap, yet very affective. Well done!Its such an ingenius machine. I like the electric winch idea to pull the borer out. Great Job.Haha that’s funny a buddy of mine and I did something almost identical to that about 8 years ago. Ours rotated a lot faster, went through multiple layers of rock, we pumped a slurry to flush it out, and stopped around 120’ or 130’. He still uses the well. It was all homemade and something I will never forget. People were amazed that we used an 2 or 3hp electric motor from an old water pump.