Old post, I know. It took me quite a bit or experimentation, but wanted to let everyone know there is a way to remove hands without cracking the arm. The arm needs to be heated with a heat gun on the 3-4 setting (just below medium) for about 20 seconds. Ideally, you rotate the heat around the wrist continuously so as not to focus the heat on one point. The hand then comes out smoothly and the other hand needs to go in immediately while the plastic is still warm. If the original hand does not come out with little effort, don't force it. Instead, heat up the wrist some more until the hand comes out with almost no force. I have now completed this process several times, the only downside is that sometimes the hand can be a little loose, but this can be avoided by not heating the wrist up too much. This process takes some practice so I recommend using some throw away arms to get the hang of it. The temperature and time are the hardest part to get right, but I would start off halfway between low and medium setting on the heat gun and for about 15 seconds and play with the time/temperature to perfect the process. Good luck, if anyone is even reading this...lol
