I was touring through Gaspe (Quebec) and a cable frayed inside the rsx shifter. I had to take shifter apart in a bike shop basement. Good that I knew how to take apart. Bad that a massive storm ripped through the same time and a lightning bolt hit a transformer outside the shop. At the exact moment of total blackout, I was fitting one of those itty-bitty screws back in, freaked and dropped it. After 1 hour searching with a camping head lamp in the floor cracks, through years of other itty-bitty parts, I found it. Or possibly, it was some other itty-bitty screw of same size.