Just FYI, for people who write a lot with mechanical pens, check out the Kuru Toga line with rotating lead engine. Every time you lift up your pen the lead rotates slightly which keeps your lead relatively sharp to a point. They are also very affordable at <$20 on amazon.
Just a note, they are inexpensive so despite some of them looking like metal they are light and plastic. But they seem high quality and dont break easily.
So, if you've ever watched me write with a pencil, I rotate the pencil a quarter turn after every word - this is a throwback to drafting class where we learned that kept lines consistent, otherwise you wear down one side of the lead and lines get wider. This pencil does it automatically, every time you lift the pencil, so every letter, it rotates a tiny bit so you're always using the sharp point of the lead. #kurutoga