My seat was recovered and I removed it and noticed the material at the bottom of the seat frame is getting cut from bouncing up and down. The material raps from front side under the frame to the back of the frame. It rubs on the bottom metal part that is welded to the floor and goes under the seat and sticks up from floor about 6 inches. that welded part goes around both sides and across the front Is there something missing? is a 1951 chevy seat.