Hello friends. I have a Gold Seal flat top that is refusing to let go of its personal point. I would like to replace the personal point, and have removed the section from the barrel without difficulty. But the personal point refuses to budge. I have: -ultrasonically cleaned the section in Koh-I-Noor pen cleaner (several times) -kept it immersed in clean water for days -used dry heat -tried hot water immersion (160 F) -tried leeching in Pen Potion #7 on several occasions, from the top and the bottom -immersed the entire section and part of the nib in Potion #7 for 48 hrs. No love so far. Do y'all have any suggestions? Nick