I have talked about my troubles with pens drying up in China, well before all the ink has been used up.
To my surprise, I recently used a pen that seemed to have the same problem. But all the sudden, the same pen seemed to put a splotch of ink wherever I began writing. Too much ink was coming out. I cleaned off the tip, and only then realized that the pen no longer had a tip. Somehow, the ball in that particular ball point pen went to some other place.
Still not perfect, but at least I can continue writing until the ink is used up.