One-Penny Bare Wire End Stop

Update: Detailed video tutorial! http://youtu.be/raBfRj1SW2o
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This is a companion Thing to my Micro-Adjustable Bare Wire Z End Stop ( http://www.thingiverse.com/thing:23811 ) -- this is actually the way all of my end stops have looked since January.
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This is about as inexpensive as you can get with your endstops, and yet they've worked flawlessly and predictably for months on end. Each endstop is fashioned from a paperclip, a short piece of copper wire, some electrical tape, and a twi