My friends and I have a bunch of old skateboards lying around from years of skating. I decided to finally do something with that.
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Take all of your old boards and ungrip them. The best way to do this is with a hair dryer or heat gun, melting the adhesive and trying to pull it off like a big sticker. Use a razor blade when necessary.
Once the hard part is done section the board off so you will have sections with the same concave. You can cut these all day long on the chop saw.