Neck Gap, Weight Change, BHUNP, Fix

[GerdWagner]

I would like to repair a "neck gap". This occurs because I have changed the weight of the NPC...
Unfortunately, when I re-generate the head with CK, it doesn't look anything like it did before....
In Bodyslide, BHUNP does have a slider for exactly this problem, but unfortunately only for the body. Which is why the error would immediately reappear if I gave the NPC a piece of clothing that had not been specially prepared beforehand. So it would be easier if you could change the problem directly on the head. Are there perhaps also such sliders for it, like below on the picture?
Or another way to fix the problem?

Edited June 15, 2021 by GerdWagner

[Grey Cloud]

5 minutes ago, GerdWagner said:

I would like to repair a "neck seam".

That's a neck gap.

[GerdWagner]

9 minutes ago, Grey Cloud said:

That's a neck gap.

Thanks, I corrected it.

[GerdWagner]

With Racemenu it also does not work, there the geometry of the head is displayed in red and cannot be imported.