I hope this is the right space for this question and to get some help in understanding this mechanical concept please.
I am trying to come up with some articulated finger extensions for a costume. The best exisiting example I can give are the skeletal fingers of Death in BBC´s "The Hogfather".
As far from these pictures and from what I ve understood here on the website, the mechanics for hands is that there is a spring or recoil mech on the top of the fingers, and a pull mech on the underside, and restricions in the movement of the mechanic makes the finger curl. Is that correct? Because when applying that principle to the fingers extension, I have no idea from where to generate the pulling force. I d be super happy for some enlightment here, guys.
There´s some images of what little I have from my own mind and potato screen caps.