Not sure if this has been brought up in another thread, but I finally got around to doing the refurb of my 5200 controllers. I bought a kit off the ebay user retrogames-r-us for $20 each. I know it's kind of expensive, but I think it's really worth it.
Here's the auction
I managed to take a pair of crappy looking and non working controllers and turn them into this:
Not only do they look good, but they actually work!!
Hey - I just noticed there's somewhat of a self portrait in that photo!