photo of the screw shoe from skyrunner.com"What a lot of the guys on the team will do is we'll take 1/4-inch sheet metal screws and just drill them into the bottom of the shoes so the head of the screw is pointing toward the ground. They're short enough so you don't feel them in the midsole of the shoe. You can just screw those in and get a little extra traction." -Luke Humphrey, Hansens-Brooks Distance Project source: runnersworld.com
screw shoe instructions here by Matt Carpenter (http://www.skyrunner.com)
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