To use "Z-clip" fasteners to secure tops to tables, desks, and dressers, you typically saw a blade kerf along the rails or aprons. To avoid any potential weakening that might result from the full-length kerf, cut slots with your biscuit joiner where the fasteners will mount. Set the joiner for the No. 10 depth slot, adjust the fence to cut the proper distance from the top of the rail (usually 1⁄2"), and plunge the blade. You can do this before or after assembly.—from the WOOD® shop