OK, I think I read that the mag plate rotated freely before you disassembled it, and you did not “dimple” the brass retaining ring. You say that the same screws came out that went back in. The mag plate binds with the screws tight, but is free when the screws are loosened slightly. Like I say, some of those coil retaining screws go through the mag plate right on top of the brass ring. If the screws are slightly too long, they will actually contact the brass ring when tightened. I know you say the same screws were used so this shouldn’t be an issue. I suppose you could pull the mag plate off, then tighten the four coil retaining screws that don’t thread into the retainer, then look to see if they protrude below the bottom of the mag plate. Oftentimes, there are washers under the screws, might you have left those out?