I do not want to use a transition piece to cross from room to room. I want the boards to go continuous from room to room through the hallway. I will need to reverse the direction of the tongue of the boards to change the direction the floor is being laid. I'm assumming that I will need to mate a groove to groove on the row of boards when I reverse the tongue. I'm wondering if this is done using a special process or maybe a tongue insert into the groove.