Hello,
In Townsend Whelen's book: "Why Not Load Your Own" edition of 1957, an equipment manufacturer's directory lists one of the things made by Potter as being a machine rest for revolvers. When I learned of the Ransom rest in the 1970s I thought that was the first.
Does anyone here have familiarity with Potter's rest? A Google search did not find a reference or any pictures.
Thank you, Brian