I've been trying to rig this model, and most of it is working fine, but the trouble is when I move the head bone the moustache leaves the upper lip and the eyes start popping out. I've tried parenting them to the head (they don't move at all if do that). At the moment I've got it so that the eyes and moustache are both maximum weighting with the head bone vertex group, and that has got them succesfully moving with the head bone, but they still pop out of the head. I've tried making it so that the areas around the moustache and eyes on the head are completely red in weight painting, but that doesn't stop them popping out and makes the head move weirdly when looking down.
leaving the head weighted as it is automatically
making sure the front of the face including areas around eyes and moustache are completley red in weight paint