Mystery threaded hole in MK2 rear door lock remote control

[LHR]

I am reinstalling the remote control locking mechanisms in my 64 MK2 doors. On the rear remote control, I noticed that there is a threaded hole. I have no idea what the purpose of this might be. I don't have my old door cards handy. Is there a screw that goes through the door card into the remote control?

The front door remote control does not have these threaded holes.

Any ideas regarding the purpose of these. I know these components were used on other marques as well. Perhaps they are not used on the Jag, but are on other cars???

My curious mind (fortunately, it still remains so!) would like to know.

Thanks.

Lin