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I wasn't fascinated so much bynthe afe, as by the sheer apparently seemingly nearly industrial precision of the grooves and holes drilled into the grooves, along with the seeming industrial similarity of the H blocks, as they're so called, I gather, which, while evidently differing in size, and, thus, not all uniform, are, at the very least, sufficiently similar to cause one to think of such industrial scale production, that's my only point, honest, many thanks.

I follow, many thanks....