Just to expand on that a bit, after deleting the arm frames, click the little triangle next to the name of the figure on the animation palette (at the top of all the other elements of the figure), and you'll see it works like a directory, now showing only the figure name. Click on the keyframe for the first frame for the figure, and set the keyframe for all elements. Now click on the Break Spline option. Then do the same for the last key frame of the animation. That'll set the keyframe and break the spline for all elements of the figure.