I might have shown this on the forum once before, but I do not think I received an answer then. The above hole is on the rear of the front passenger door. It is square and definitely looks like it was put there on purpose when the car was built. I could be wrong of course.
What is the purpose? Why is it there? Does anyone else have the same hole? Was it to hold a horn that had a square post on the bottom of it to hold it in place?
Inquiring minds want to know?
My tourings have the square hole for the steel support rod (round shaft,square end) for the side certain on all the doors.
Does anyone have a picture of the support rod for the side curtains like Frank has?
Some of the 26-27 doors had a brass/nickled ferule there,but the holes were all square for the side curtin rods.
The side curtain on the right front door of my '15 is modified to open with the door, as are the side curtains on my '17 and '14. It saves a lot of trouble getting in and out of the car when you are on tour in bad weather.
Obviously not needed if you never drive your car except around the neighborhood on nice days.
I have one of those sockets on the door of my 1924 cut-off pickup, but apparently it takes a uniquely shaped rod end, the improved car rod doesn't fit (I tried).
Does anybody have an extra side curtain rod made for the socket shown in Royce's pic? I only need one, thanks!