Quite easy, but stay sharp: apply a drop of superglue in the joint and slowly rotate the limb. Or, if it's a leg that won't go round 100%, just move it back and forth slowly. This will cause the glue to be smeared throughout the joint. Just don't stop too soon, or the limb will be glued shut. You'll know when you're almost done, if the glue starts to settle and dry out. Just keep moving it a bit more, just to be sure. And test it first.... on cpt. Solo. Just kidding, just use a leftover fig, if you have any.