You've mentioned or confirmed two specific locations where you found ink stains: (1) between the plastic grip and the metal part of the section, and (2) the one you mentioned in your second post, where you seemed to be stuck with two spots on the nib/feed collar. I understand you removed the nib and feed for cleaning and worked on that part of the project in earnest. But I'm curious: were you able to unscrew the plastic grip from the metal part of the section to clean the stain(s) you found there? What happened to the ink you saw between the plastic grip and the metal part of the section?
Sorry for the confusion, I thought you are talking about the space i mentioned . So no, I don't have ink trapped around metal part of grip section (luckily). I tried to unscrew the metal part but it seems to be glued while screwed in. The only stains i have are in the plastic portion of the grip section slightly mid way in the clear plastic portion of grip.