Leon Schlesinger’s studio, actually.
And it was Maddie who was the one with the True Grit, not Rooster, who was for the most part just a blustering drunk, except when it came to killing people, at which he had a real talent. His moment of glory was carrying the snake bit Maddie to the kind of medical attention that removed her arm. Whereas Maddie never wavered from True Grit.
As for Thor’s hammer. Who knows?