I went to put together a new US General box the other day, and was miffed to find that I couldn't get the bolts for the casters to start in the threads. Then I looked closely at the bolt I had been trying in all of the holes and noticed something funny -- it didn't actually have a proper thread (i.e., a spiral) cut into it -- just a series of parallel circles along the axis! Not sure how they pulled that trick... 




[/rant]