How do you use the clamp to secure the sharpener?
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The sharpener is actually designed to be a portable sharpener without the need of securing it to a surface. The sharpener can be mounted to a shelf using the metal clamp. Most prefer to keep their sharpener portable as the clamp does not hold it in place very well. I have included a link to a video that one of my customers has made for me. It shows how the sharpener can be mounted. Some have also used heavy duty velcro or hot glue to attach the sharpener to a table top. If you try this, make sure you use lots of glue. Another customer has suggested a product called Sugru and claims that it works wonderfully.