I had a couple of people email me about a mysterious problem with their Lamy Studio suddenly not being able to close or post. I played around with my Studio for a minute and discovered that the trim ring on the grip section is actually removable. It’s not common, but over time, the trim ring can unscrew and become detached inside the pen cap! A simple removal of the trim ring from the cap and rethreading back into place will get the pen working like new again.