hi. i am about to replace my patio doors with an arched set of french doors. my question is instead of replacing lintel with an arched one , saving all the knock out inside, would the lintel that is already in place lose any strength if i cut the front ledge(which would normally support the exterior bricks)so that i can build the arch over the doors? the bearing would still remain as would the interior part of lintel and wall above. thanks for any advice,ron.