On the lens cover of my graflex series D( not super D)
it protrudes (like the end of a tin can) for about half an inch.

Also on the lens cocking mirror setting panel
the 'screw' at bottom right looks like a contact for a flash lead of sorts.

There is what appears to be some sort of holder for a flash bracket also.

A guess on 1. is to accomodate a telephoto, but I dont see these on Ds eg on e-bay.

But Im stumped on 2.

thanks
g

A lot of these old cameras have been modified by the owner to suit his needs....
Sounds as if your camera falls into this catagory! Do you have the means to post a photo?? Bert