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Ed,
thanks for the comment. Sorry to be thick but I've read this three times and I'm still not quite understanding what you mean by shoulders. I get the file flex. I hadn't thought of that before. I tend to use big 'bastard' 10" files when cutting with a file guide but I can see where a smaller blade/file would be different.
Is what you mean this?: You are pushing on the file on the top and bottom so that the middle, cutting part of the file bows toward you and this creates a convex plunge cut?
Scaling up the design would be fairly trivial I think and is worth looking at. I'd like this to be an heirloom quality tool.
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