In the picture above I have done the last finishing touches before it´s off for welding together with the brackets. I wanted this part to be welded by a professional, just to be safe. The finsihing touches was some small fillets on the edges and a chamfer on the hole so that the ball stud could fit correct.
I actually did a lot of FEM simulation to get this part as strong as possible. As you can see the inner radius is actually not a radius, but an elips, this distributes the loads onto a larges volume witch decreases the stress levels on the inner radius.
I probably have the only wire-EDM manufactures tow hitch in the world. Well the reason is that the milling machine was occupied and the wire EDM was available.
Big thank you.