I would say that this would have gone from the Cadet Foprce to the outside contractor to be accurised and not done as part of any military contract. Quite how ball burnishing worked - or didn't work, depending on your point of view and/or naivety - has mystified engineers and musicians* since it was dreamed up by '.....someone'. We say that it's based on fuzzy logic. Anyway............. you'd often see a Cadet No4 with the 'Regulated by Fulton' mark on the nocks form and it was accepted that they'd been sent there for accurising.
*The people who know best about vibrating tubular instruments are those with a degree in music - for obvious reasons