When John was restoring the Water Torture Cell after the Niagara fire, he called me and asked if I knew if there were two Water Torture Cells. I told him there were two with interchangeable parts.
Hardeen sold the working cell to Sid Radner. Apparently, the other cell had been cannibalized for parts.
Hardeen called Sid and asked him what spare parts he had, but, was never able to rebuild the second cell.
John made two identical cells. One included several parts of the original. The story I got was that in the second cell John built and has had since, there was one original part.
To see this Water Torture Cell is to see the restored original. I photographed them both and I can't tell one from the other.