[Retired Starman]

For those wanting a source of precision pots, they actually have them at McMaster Carr! They call then "Variable Output Switches" if you can believe that. They are on page 856 of the current catalog.

While the catalog doesn't make it clear, they have pots of differing resistance. When you call your order in, they will ask what resistance you want.

The one-turn pot goes something less than 360 degrees, but more than what you see on the usual pot. We're using a 5 turn pot on our arm's gear box geared to make good use of the arm's range.