mall bracket insert from FIG. 8A; [0043]FIGS. 12A and 12B are a side view and a front view of one knurled insert from FIG. 8A; [0044]FIGS. 13A and 13B are a side view and a front view of one smooth seam insert from FIG. 8A; [0045]FIG. 14 is an exploded side view of a related ultrasonic welding machine; [0046]FIG. 15 is a side view of an assembled, related, ultrasonic welding machine of FIG. 14; [0