Let's start with
Tool Prep. Our favorite choice is
True-Grips. Apply several circles on the back side of any tool for the ultimate grip while cutting. The secret is that little hole in the center. It creates a bit of a vacuum.
An inexpensive alternative is ordinary packaging tape. Make a long loop, sticky side out and put that on the back side of your wedge tool. You can use several smaller pieces as shown or one long tube running the length of your tool.