When cutting soft woods with my jigsaw, the steel shoe (base) always left unsightly marks on the workpiece. So I bought some self-adhesive polyester film (such as Mylar) at a crafts and hobby shop, and fit a piece to my saw's shoe. After thoroughly cleaning the shoe with alcohol to remove any oil or grease, I applied the sheet to the shoe, being careful not to trap any air bubbles.Now my jigsaw glides on the workpiece without marring it. You could use the same material on your circular saw's shoe to protect the wood underneath.—Rusty Ingram, Cedar Grove, N.J.