Hello! I recently picked up a little gold filled, ring-topped Wahl pen, and I mean little. It measures up to about 3 inches long capped, 2 and 3/4 inches uncapped, and just a bit over 4 inches posted. I would love to try out its soft nib (the nib is size 0), but the sac is dried and the section is not coming off, and I do not want to break it. Also, what size would the sac be? Here are some images. (the gap between the section and barrel was there when purchased)