Re-using a facegeom from a Custom Race follower for another character

[astralara]

I've tried to extract faces (facegeoms) from custom race characters before, but when I import the head nif into Racemenu's face sculpt, it never works for me - face is always grossly distorted.  Does anyone know how to import custom race faces to get them to work in Racemenu for new, personal character creation.  And again - this is for my own personal Skyrim - wanted to make that clear before anyone flamed this post.  I just would like to know how to make it work as I often see characters that look great, but it's fun taking those characters and tweaking them in Racemenu to come up with something new from there.  If anyone can give me some info on how to do this from custom race characters - that would be very cool   Thanks.