If the nut is to fit the SBAC-60-splined H.S./de-H props then it’s got to be Hercules/Centaurus, Sabre size of engine (choose your own aircraft). Too big for the (50-spline) Spitfire,Lanc,Mossie etc., so nothing to do with Spitfire wheels or engines – or Rolls-Royce.

Anon.