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It is fairly easy to broach out the 1/4" hex hole by drilling a 1/4" round hole and then pressing through a worn out hex bit that has some shoulder to act as a cutting edge. I usually press it in a vise with nut as backing to provide space for the bit. You can instead use a hammer but easy to get it off straight. . Follow that by a little careful filling on backside and hex sides but it does save time.
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Nice work. I'm lazy and just drilled a couple of holes through the uprights and brace then pushed nails into the holes. Used nails into one side for holding the blade. In Nepal I ran into some neat saw blades, like a hacksaw blade twice as wide with wood cutting teeth on one side and metal cutting teeth on the other. This would make a great combo tool. cutting a slot in the uprights for the blade does improve the tool.
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