Additional end joint

In order to join the end where the animated arm finishes and joins Stuarts Model, I decided to create an object that was diamond shape, but rounded on the edges. To do this, I drew the lines in the front view, then extruded it. Capping the back made the object solid. I then converted this to an editable poly and selected the vertices. Once selected, I was then able to manipulate the object so that it resembled the shape that I required.

All of the ends are now connected correctly , and the image below shows the new additional end joint used to connect Stuarts model: