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The pen tip bore is very precisely sized (⌀0.0995+0.001) at leaving no room for the refill point to wiggle and click.

Thirty degree grooves are on both ends of the pen to a length of 1-1/4" - 32mm from the tip and 1/2" - 12mm from the top of tube. The edges of the grip grooves are crisp and grippy.

The action of the pen is a triple start screw thread which raises and lowers the pen tip quickly.