Perry, Im not following. When I slid the middle piece in I had to remove all the bolts that held the front end to the frame I think thats why it happened. I had larger 3/8 bolts that i replaced that were installed that fit in the channel 1/4in thick 1x3 that was there. NO doubt when the bolts werent there the aluminum channel lifted off the actual frame and there was definitely stress there because the rusted bolts as i was removing them popped off as if they were under a force.
Here is where the bolts were with a red circle left and white circle red.