Then use sandpaper to smooth the surface as well as possible. Great? not yet… Carefully mark the second piece and use the same woodworking tools to cut out that piece. and use P80 sandpaper one more time to smooth each side of that piece of wood. Cut the sandpaper to specific size and mount two office binder clips on each side. As you've probably already noticed, this is a DIY manual sander that you can use in any type of woodworking projects..