Another Interesting Poka Yoke

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Last week Bryan posted about a poka yoke (error proofing) that he found when he bought a kitchen table (here.)  Today I received a piece of office furniture and was frustrated when I looked at the instructions (I read instructions when on company time – I only follow my y chromosome driven instinct to disregard instruction until after I have screwed something up on my time.)  The instructions showed that the back of the chair should be attached to the seat of the chair with a socket head cap screw, a flat washer, and a lock washer.  What was not clear was what went where? 

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