Resilient floor installers have a tool in their bag of tricks that might be a lifesaver for a remodeling contractor. This tool is the Crain Super Saw — a flush-cutting circular saw designed for undercutting doors, jambs, casing, and baseboard. To test the Super Saw, I took it on site to install a hardwood floor over an existing plank floor, and put it in the hands of a remodeling contractor who found the Super Saw useful for solving a variety of problems on the job. Undercutting Specialist The Super Saw is manufactured by the Crain Cutter Company (156 So. Milpitas Blvd., Milpitas, CA 95035; 408/946-6100) — a toolmaker that specializes in tools for floor installers. The Super Saw is adapted from