Nikkor-S 50mm f/1.4 discussion and variants comparison.

[richardHaw]

Here is where it can get confusing. As you can see, there are 2 holes in each 120 degree point. one is for tightening the limiter adjustment ring (screws still there) and one is for securing the focusing ring (screws gone).

[John Geerts]

Thanks for the picture, Richard. That is exactly the situation at the moment.

[Erik Lund]

It is supposed to look like that, there never was any screw heads.

[John Geerts]

Perhaps my technical expression is not so good

I was looking for the tiny small screws to connect the focus ring to the helicoid  (those screws broke and focussing is impossible now)