Hi, I was building the lego 8109 in recent days with my own parts and found an interesting thing. Because of the lacking of the 2010 new part 87408, Black Technic, Pin Connector Toggle Joint Smooth Double with Axle and Pin Holes, I decided to find the way of replacing. It is so easy and seems to get the same effect. So I wonder if it is necessery to use 87408 here?