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I just finished a fill of KWZ IG Mandarin ink in a TWSBI Eco piston filler, and when I went to flush it the piston was extremely sticky moving forward in the barrel... and then when I tried to draw water up, the piston rod popped out of the piston head. I finally somehow managed to get it reattached and had to use a needlenose pliers to pull the piston out with great difficulty. I've read the usual threads on iron gall maintenance precautions like this, and I've always been careful to not mix them with other inks and flush carefully, with a cycle of dilute vinegar between distilled water flushes. So I got the piston assembly out and pulled the nib and feed for good measure and let the body soak in a 10% vinegar bath overnight. Now it looks like this: A gentle cotton swabbing does nothing to remove the cloudiness, and when I try to re-insert the (well-lubricated) piston, it won't go past the edge of the cloudy area--it feels like there's a ridge of residue blocking it. Anyone ever seen anything like this? Is this body salvageable?