Lately I've taken a liking to Fisher Space Pen refills for rollerball pens and found a few interesting hosts for them, but still have not found one that is good to carry in a pants pocket and convenient to use.
The clicky style trigger too easy, so are not suitable for a pocket, the bolt action is secure but too big, and though the bullet style is compact and easily pocketable, there is a real chance of losing part of it since it separates into two pieces. I hate the twist style so they are non-starters.
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