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Help needed!  Three "rods" pushed one-by-one via one button - how?

Question asked by Pasi Reina on Mar 18, 2016

This engineering dilemma is making me lose sleep.


Imagine a triangle with a pushable "rod" in each corner.

In the middle is a button that needs to push one of those "rods" and when pushed again, it pushes the next one. Cycle repeats.


Sounds simple right? Well, I can't figure out anything... Ballpoint pencil has similar'ish rotary system but it's quite complex.


Give some ideas, examples, pictures, anything...