How To: Build A Custom Bookcase

Step 3 Rail Slots

For that task we set up our trim router with a 3/4" straight bit and side guide attachment. We got the slot where we wanted it by using a small piece of scrap to align the guide and the bit to run a 3/8"slot about two inches from the side on the inside - though whatever looks and feels good to you will work just fine. A quick test-fit of our rails put our minds at ease; we'd gotten the right width and height for the rails, and the screws that fasten them weren't going to stick out of the slots and play havoc with the removable shelves.