Lets say you want to give a figure some new Fore/Lower arms, Heres how.....................First, take your figures lower arm off, try hard because it may take a while, you may want to heat up the figures fore arm up so it'll soften up the plastic & make it much easier to take off, Ok do the same to the other figures fore arm, Now take a lego skinny cylinder peice (or any thin cylinder type thing). Take the fore arm piece to the arm & keep the holes aligned, Put the thin cylinder peice through the holes cut it down to size & there ya go,

Well thats it & Have A Nice Day :D -Jay