The above two photographs clearly show the curved actuating lever making contact with one of the offset G keys.
See also the switchable split E mechanism
Go to general details for a fuller description and general photographs of the mechanism
For more information on this subject go to The
FAQ on the Larry Krantz Web Site
The above photograph and notes are as accurate as my knowledge on the subject permits.
If anything above is factually incorrect, or if anyone can usefully improve or add to the above notes then please feel free to email me at john@fluteweb.net