Very intersting question and sorry to say I have no answer as of yet. Ive looked in just about every book I have on the spitfire and have found nothing on servicing and handeing stencils.
I have a basic diagram of the main stencils for the Spitfire MkI to MkV, if that would be of help? The differences between these anf the MkXIV would involve specific fittings, oils types etc.
Terry.