The back plate that warped was pretty bad, I added the piece of angle on the top, but did not help. So, I cut a new piece of 1/4" plate, started cutting around the old plate, did 2 cuts and set it back down and what do you know, it laid flat again. So, I started welding my 2 cuts up, got a little warp again. Cut it, then did a couple 1" welds, took water hose to it and cooled, repeat and it is good to go.
I welded the arm directly to the hub, built it up with a few passes with the welder. Should hold no problem. Need to pick up a belt. Foot pedal is not going to be in till mid week. Do a little grinding and hit with some flat black. Add some supports/gussets to frame and tie to the front support which I need to build.
Got a couple rolls of plastic ordered, a handheld plastic dispensor I am going to mount to the arm.