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Took me forever to find a spring that actually fits these pens, and this one snaps right into place with zero fiddling. My pen's back in action and clicking smoothly again, which is all I really wanted.

My favorite pen’s been out of commission for months after the original spring vanished, and this one dropped right in and restored that satisfying click. The tension feels just right, not too stiff or loose, so I’m back to using it daily without a second thought.

Finally, a spring that actually fits my Retro 51 without any fiddling—it clicked right into place and the pen action feels just as smooth as the day I bought it. I’d been using a paperclip as a makeshift fix for weeks, so this tiny replacement is a huge relief.