I'm looking at my copy of this lens as I write this. There are indeed two small indentations directly beneath the f/4 and f/8 marks on the aperture ring, indicating the position of the screw holes for the forked coupler. These are blind holes though and will need to be drilled and tapped to accept the mounting screws for the coupler. Tapping the threads into the hole may even be superfluous. The aperture ring on this lens is a relatively soft plastic and the steel screws should be able to act as self tapping screws. Any competent camera repair guy should be able to do this easily. In fact it looks to be a pretty easy DIY job if you have the tools. As for the forked coupler interfering with other cameras, all I can say is that is doesn't with my N90 or F100. I've used AI and AIS lenses with couplers on the F4 or F5 cameras, and there is no problem with these cameras either. Can't say for sure about the other models, but I think not. If it does, it's easy enough to remove the coupler (only two screws hold it in place) with a jewelers screwdriver. The hard part will be locating a coupling fork. These are hard to find since they've been out of production for a long time.