As a proven design found all over the web, simply a block of wood that can be clamped into a vise. The width gauge on the top can be adjusted with the two screws to set the distance between the razor bald and the gauge. The razor blade is clamped into the wood with the two screws on the side. Cannot be simpler or work better. Draw leather across the tool to cut straps the width you want. Obviously a small safety concern with the razor blade being unprotected during use.
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