Have you checked out Ian Davis? He has been building[1] mechanical prosthetic hand-fingers(4) for a while now, He's currently in the process of upgrading his old design.
He's a gentleman and I think he's responsive to communication regarding replicating his designs.
He's a gentleman and I think he's responsive to communication regarding replicating his designs.
[1]https://www.youtube.com/channel/UCv1xxFkEiAdCVy6foEEUIvw