Here are some photos showing the tabs being bonded in place. Panel Bond adhesive was applied to the back of the tab and to the corresponding area on the shell. It took a little practice in applying the adhesive to get the correct amount. I wanted a little squeeze-out around the edges of the tab so that I could trowel it smooth and create a fillet of epoxy around the edge of the tab. Plenty of guide lines, a square, and a laser line helped me locate the rib exactly where I wanted it. The last photo shows all four tabs bonded in place.