Making an adjustable sled runner

Wooden runners for sleds have a tendency to expand and contract with changes in humidity and may fit one saw, but not another. It is easy to make your own adjustable sled runners. You can buy runners made of aluminum or plastic, but they require precise drilling for screws to fit... a source of frustration and error.These, the result of years of experience making table saw sleds are intended to help. I originally published this tip in Fine Woodworking.