Only take certain pens out of the house, the Pilot 78G is one that often goes to class, in a pouch. Last week took one to town while shopping and stuck in my jean pocket. Reached for the van keys and out flipped the pen on to the cement and rolled under a car. Once home started to unscrew the cap and heard, "slide, clunk, slide, clunk. Headed for the sink. Opened up, ink everywhere, Nib OK, but the Aero filler... I always thought was permanent... was the slide clunker.
Seems to work ok since I put back together, doesn't look broken. If it is removable, what converter/cartridge might work? Have another 78G that takes a international convert/cart. This one won't.