well, the first thing I did was put a ample amount of velcro on the back of the thigh for measuring purposes..then I squeezed them onto the bottom of my thigh, and then mrked it in the back both at the botom and the top of the thigh...I then slid the thighs off and took the velcro off and drew a line from the bottom mark to the top mark, then I glues them together with ABS glue, here is a pic of my thighs, as you can see they do not have the square FX look anymore, I think that it is crucial to fix the thighs on the FX in order for it to look at least better