All of the Button Click Sierra kits (regular, Elegant, and Elegant Beauty) have the new style silent click mechanism.
The Sierra Button Click pen kits use the 61.5mm extra tube.
The Elegant Sierra and Sierra Elegant Beauty Button Click pen kits use the 60mm extra tube.
Shown finished with a Union Jack Lava Explosion Alumilite Pen Blank (sold separately).
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instructions can be found on the FAQ page. The FAQ page can be accessed by
clicking on the FAQ/Instructions link in the Information box on the bottom of
the right hand column of every page.