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IIRC, the tutorials in the Stickys have some. Also a search for "file work" ( it isn't usually called jimping) will get you lots of hits.
https://cse.google.com/cse/home?cx=011197018607028182644:qfobr3dlcra
I had an idea to drill a piece of steel with a tight row of straight holes and use that piece as a template to drill the holes in a second piece. CA glue those together so the holes line up perfectly, ream, and profile the steel down to where only half the row is left, i.e. semicircles (or CA together first then drill the holes through both pieces). Drill a couple of alignment holes far from this side to allow for the width of a final workpiece. Harden the steel to a high Rc and use those pieces as a guide/jig by sandwiching the actual workpiece between them in a vise and going to town with a file. Should make consistent results.
I could sell them and make a million dollars, or maybe even my money back!
Mark
like the pics, don't know if I want to invest in a specialized tool like that right now. But now I know.Maybe you wanted file work not jimping, but here's a thread I did a while ago that shows how I do actual spine jimping.
http://www.bladeforums.com/forums/showthread.php/1272965-How-I-Jimp-a-Spine