this is from memory, it went AWOL from the bed of a pick up... 16" Collins SA machete, approx 2"max blade width ...IIRC used a piece of 1.75" PVC tubing...heated it in a propane fired New Braunfels BBQ grill till pliable... flattened end of tube with 2x4... inserted blade as I worked the tube flat to keep from over flattening tube.... reheated once I had the preliminary shaping done, then reinserted blade with a folded piece of thin (non corrugated)cardboard to provide a little clearance, and clamped between two pieces 2x4 in a vise.. pop riveted a piece of webbing on for belt loop... trimmed to shape and finished on a sander