I assume that you want to add a ball joint to his head? There is a great section on this site dedicated to tutorials for subjects like this with topics ranging from the basics to advanced of customising, even to photography and illustration tutorials. You'll find the table of contents here and I recommend you take some time to go over it. It makes for some great reading. http://www.tfw2005.com/boards/tutorials-how-tos/201900-table-contents.html On the subject of the head, there is a specific tutorial dealing with your request, this refers to Energon Megatron, but the basics remain the same. Find the link below. http://www.tfw2005.com/boards/tutorials-how-tos/214525-how-make-ball-joint-neck-tutorial.html Best of luck with this and I hope it comes out well for you