Out-of-square cornerswith the “BIG 12®” Square & Layout Bar™ Usage Instructions for OUT OF SQUARE corners. Download Instructions 1. PROBLEM: An out of square corner. 2. SOLUTION: Remove the 2 hex pegs (and bolts) and loosen both Layout Bar™ wing nuts. Place the Big 12® Speed®Square flush with back wall. 3. While holding the square flat and tight against the back wall, align the Layout Bar™ flush with the side wall and tighten the rear-most wing nut. 4. Keeping the square in position, tighten the front-most wing nut. 5. Place the now adjusted square on the edge of the countertop and transfer the corrected angle. 6. Stand the Big 12® Speed®Square to mark the back splash. 7. Final markings… ready to be cut. 8. THE RESULT: a perfect countertop fit.