…and the welds are ground smooth. Originally, the floor and inner sill was all one continuous piece, in our world now, they are two seperate pieces that must be welded together in this fashion. You theoretically COULD spot-weld these instead of plug-welding, but it’s tough to get a tight fit that way, and in addition, the footwell section makes for triple seam… Screw it down tight as we have done and plug weld it – it’s the best and strongest methoid in my opinion.