This post is a review of a youtube video that was sent to us by a customer done by Crimson Custom Guitars. A link at the end of the post will bring you to this video which we recommend you watch in its entirety. The video of 15 minutes is well done and shows the theory of sharpening any metal cutting surface. One of the most interesting parts is at about the 10 minute mark of the video where Ben Crowe shows you how to make a custom stone out of soft wood. It is an ingenious idea that works remarkably well with the use Autosol metal polish as shown. To see the video click here. To buy Autosol metal polish click here to purchase it from our recommended Autosol online distributor.