EDIT! I went back to my box of junk and found a defunct bot with round hipjoints that were held together with a pin.. so long story short. He has arms that have a double jointed elbow (ish) but it did tahe some blood (cut my finger) , sweat and a big scare I had to cut the arms in half on the smallest part and then I had to cut two cavities to make room so I could glue the pegs in. It all worked out and now here are some pictures! it is a small hinge that works quite well, O believe that once it is painted no one would be able to tell this was not originaly there.. Now I need to fix his upper torso and connect it to his legs and then it is time to cut him open and make sure all lines up, and transforms as it should do in my head.. I am getting excited!