Tail surfaces - 109F versus 109E?

[Kutscha]

From the introduction in 'Aircraft Archives - Fighters of WW2' Vol 1

"The books in this series form a representative group of subjects. Each is a typical example of skill and dedication applied by an amateur researcher over countless hours of translating measurements and photographic interpretation into a multi view scale drawing which, in fact, no manufacturer's general drawings could ever provide! For it may come as a surprise, but the reality is that manufacturers' general arrangement drawings have little value in the factories, are rarely accurate in shape or scale and. without exception, illustrate the aeroplane in a stage long since superseded by production variants. It is the sub-assembly, or component detail drawing, which offers priceless data for the researcher to complete the jigsaw puzzle of any aeroplane."