With a specially designed mechanism, the Tremell ballpoint pen kit provides at long last, a click ballpoint with a reliable and trustworthy clicker, that keeps on working. Since its introduction in the Autumn of 2016 there have been zero reports of failed mechanisms, or failed anything else for that matter. It is quite probably the most reliable click pen kit on the world market.
 
When making this it reminded me of the rock I used to get as a present when someone went to the seaside.