You don't need a six foot tube to cut a six foot hole, you could do it with a one inch tube if you wanted to, you would just have to break off the core more often.
That last part is so funny, it bears repeating; "If the pipes were not perfectly circular then neither would the holes in the granite. Think about it." That's hilarious. By your way of thinking, a squre tube would cut a square hole. Think about it, and use your head, the tube could be eliptical and still cut a round hole, the part that changes is efficiency.
Let me repeat the question. How did you suppose the ancients made perfectly circular tubes?
You skeptics are digging a deeper and deeper (bore) hole for yourselves, that you are never going to get out of.
You are making claims that you can never substantiate.
This is why AA authors sell millions of books.
This is why there is a growing movement away from orthodox archaelology.
Every attempt to substantiate the mundane methods that the ancients were supposed to have used runs up against major technical flaws and for the simple reason that they have not been properly thought through. It's all just a question of ad hoc assumptions when put to the test.
And worst of all I am being distracted from my TT thread and I need to get back to it.