A veteran stair builder describes a nasty fall in this April 2013 thread.

Stan Foster, Central Illinois Lowest time in my stair-building career ... 16 days ago I literally hit bottom. I made the totally idiotic maneuver of going down a freshly interlocked stair section from the second floor to the first floor. The bottom half of the stair section wasn't nearly as secure as my neanderthal mind assumed, and it broke...

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