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LJ,
A bunch of years back I took apart a 105mm Nikkor-P to learn how it all works. In that lens the helicoids would turn 'within each other'. To keep the lens element assembly itself from turning when you turned the focusing ring there was a small brass projection attached to it that moved forward and backward in a slot machined in one of the helicoid's parts. This projection stopped the lens itself from rotating. This projection was split down the middle and had a counter sink headed screw screwed into the split. If this projection narrowed, or the slot it traveled in widened, through wear one could increase the width of the projection by screwing the screw a little deeper into the projection, thereby taking up the slop. Very clever. Perhaps your 1.2 has some slop that has to throw that projection to one side or the other of its slot and you're feeling that as a moment of free play when focusing. That 105 is #126380 and supposedly dates to 1959 or 1960 so your lens certainly has a different mechanism. But perhaps not that different.
Good luck
s-a
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Yes, I call that the Key, in the Ais (I think, it could be different in the Ai version) it fits into a smaller slot than the larger brass that the older Nikkor-Auto 105mm P has. It sounds to me to be the key may need that adjustment. Over time there can be wear on that key, I should look at mine but I know if I do I'll probably take it apart and replace it. The slot the key linearly travels in can wear, that's why you can very precisely widen that key so there is no slop, Don't Overtighten, start with One Hour adjustment (only turn the slot the amount of one hour as if the screw face were a clock face) and test, if its still too sloppy add another hour. In addition, the two screws holding that key can develop some play, I think I recall on the Ais version it may be held by the red Nikon sealant. Now that I think of I am going to check out the internal build of my Ais shell. Stay tuned.
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Don't everyone take your lenses apart on my account!
This is very interesting though, I may just open my 1.2 to see what I can see; if I make a mess and can't get it back together, I'll have an excuse to get the AI version (unless my wife finds out what I've done 
I should clarify what I meant in my original post, however. I'm not having trouble with my photos being out of focus. I'm merely picky, compulsive, and prone to anxiety 
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Just put my Ai back together, and yes, I DO NOT recommend anyone dismantle their fine Nikkor optic unless they have experience and are willing to take the risk.
The Ai version has the larger slot/guide assembly, with the sides of the slot adjustable, both sides being actual plates, held in place by 2 screws each.
I will check my AIs version.
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