yes, its easy. I did a tutorial over on the Menwithdolls forum. It involved harvesting a Triad alpha for parts.
Just register for menwithdolls, and its hosted there. Its called "Peanut and Pipsqueaks otaku/alpha hybrid tutorial"
Failing that, I've done a ton of hybrid jobs, I have a spare part for this arm, available for the cost of postage from the UK.
The arms can be removed easily, just dunk the torso in a covered jug of boiling water for about ten to fifteen minutes and the shoulder should pop right out. I've done about twenty of these now.
Just send me a pm if you want the arm