I am building a router table, and have the Jessem Mast-R-Lift with the Porter Cable 7318 router. I bought the template for the Mast-R-Lift to route the ledge in the opening. However when I set the template over the lift it's about 1/8" bigger on all 4 sides than the top of the lift. Is it supposed to make a ledge that much bigger than the lift?