@ Alan/Simon/Tom: Skinning Trouble

I'm having a bit of trouble with the first skinning tutorial. The l_pinky_jnt3 is not bound to the skin, although the rest of the rig is. I've normalised the rest of the weights, but when I tried to find l_pinky_jnt3 in the component editor, it was missing, so there are no influences for the joint. Is there any way I can fix this without having to start back at the beginning?

 The detached joint

All the joints in the component editor, missing the two pinky joints