Trying not to make a mistake and have to redo it. I have this 20ga fowler that I built and it is shooting low. There is no rear sight, but the PC/HC notch that is filed in line with the tang screw, screw slot. The front sight is also the traditional short front sight so there is no material left to remove. So, I need to bend the barrel to raise the point of impact. Here is my dumb question. To raise this "point of impact", which way do you bend the barrel, up or down?