Thanks Rand. It looks more complicated than I thought. Fiegel book, for example, shows much easier process - simply cutting the line with the chisel, but he mentioned press and dies as well.
I understand now that the technique would be the same for producing any lines, vertical, angled, etc, however only vertical lines (Kirk) pattern was used almost exclusively. I am sure it's because of "40 steps", i.e. ladder concept. Can we assume that zig-zag, cross, etc variations were made as experiment, decoration, etc, hence are not associated with the "Kirk" pattern?
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