[brent13a]

.....I think that strongly supports the use of a machine to make the cuts.

Thats a wildly illogical deduction based on zero evidence.

You're saying that because it's 1800 years old that the people living in that era were too retarded to figure out how to draw near-perfect circles, nor cut them by hand. Okay.

[ProtectOurFreedom]

Cutting perfect concentric deep-groove circles by hand? Sure. Easy-peasy.