The locking ring on the end of the pen pulled off and got jammed in the top. I had to remove the clip and top screwed cap to get it out. I put it on the pen but ink poured out from the ring. I removed it cleaned it all up and Araldited the ring on. Stopping it coming off and sealing it. I had to clean out some of the plastic liner from the cap because it was too tight on the ring. Anyway its now OK and writes really well.