How does one polish granite to that standard? With what ?
Had you bothered to watch the first 3 mins of the Parthenon vid I posted, you would have seen that they couldn't use modern tools in the restoration...in the first 3 mins it shows them polishing and smoothing a 10 ton block from the columns. which had to have its surface so finely ground to create a precision joint, you really cant have errors in columns.
They used the ancient technique for smoothing/polishing, so simple, and highly effective. But as said before, you wont watch what I post so you will always ask dumb questions like above.