Shaping, cutting, milling, grinding, drilling, finishing and polishing apparatus and machines, including components and accessories therefor, such as machine tools such as blades, saw blades, knives and other material removing tools and holding and handling devices for such apparatus and machines, in particular such apparatus, components and accessories for shaping or forming blanks and cores for watercraft, in particular boards, such as surfboards, windsurfing boards and other similar recreational boards having a flotation core or blank that is shaped during fabrication