There is a tube (13/4"x .120 dom) coming out of the box section of frame that makes up the stinger. You can see the other shiny circles on the side of the box section, that is where I spot welded the tube into the box section, along with welding on the end. Also a piece of the 2x3 underneath to make a gusset. I slide/hammered the tube around 14" or 16" into the box section, then wedged a piece of 1x1 squared tubing underneath it about 6" long. So the tube was slide in, spot welded, 1x1" wedged underneath, then a pie shaped piece of 2x3" used as a gusset. You make a good point, hopefully I covered everything.