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From Fellrnr.com, Running tips
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As you may know from my previous post on primal running shoes, I modify my Nike Free shoes. The Nike Free is an ideal starting point for modification. Instead of a separate cushioning midsole and a hard rubber outsole, the Free combines the two into a single layer. This cushioning is much tougher than a conventional shoe, so it withstands the abrasion without an outer sole. Modifying a conventional shoe requires removing the outsole, cutting away at the midsole, then reattaching the outsole. With the Free, you just remove what you don't want. (Note that I use the Nike Free 3.0.2 as the starting point.)
== Stage One - The Sole ==
http://jfsavage.smugmug.com/photos/709446336_sLazM-M.jpg
I've tried quite an array of tools for modifying these shoes, and my preferred tool tool is a cheap sheath knife. The knife is a Clipper and is a remarkable knife for the price - I've abused mine horribly and it's still in great condition.'''Update''' Using an electric knife works much better. It works much faster and allows for higher precision - http://www.amazon.com/Cuisinart-CEK-40-Electric-Knife/dp/B00004WKI3
http://jfsavage.smugmug.com/photos/709446524_RCRA9-M.jpg
