I was out riding with the kid today when my rear derailleur abruptly dropped 
all the way to the bottom cog. I stopped, undid the corresponding bar end 
shifter (a Gran Compe EnE from Velo Orange), wiped some gunk off and put it 
back together. It worked for a little while but soon gave out again and I wound 
up holding the shifter in place to make it up the climbs on the way home. After 
taking it apart, cleaning everything, and reassembling the shifter, the ratchet 
mechanism inside the shifter simply won't engage (I've made the bike usable in 
the meantime by adding a rubber washer to the assembly, which I did once before 
when it turned out I had a defective Riv Silver shifter on another bike). The 
shifter was pretty gunked up with sweat before this happened. A couple 
questions: 

1. Is it possible that sweat got into the ratchet mechanism and caused it to 
fail? Seems unlikely, but I am a notoriously sweaty guy. 

2. The cable attached to this shifter was not that old (6 months?) but on the 
verge of being corroded into the lever. A moot point, since it seems like I'll 
need to replace the whole shifter, but how do fellow bar-end users prevent 
sweat from ruining these things? Should I be greasing the cable end to keep it 
from corroding into the shifter? Is there a type of lube that works best to get 
sweat out of the washer assembly? 

Any advice is appreciated. In the grand scheme of things, a bar end shifter is 
far cheaper and easier to replace than an STI lever, but it seems like I'm 
harder on these things than I should be. 

-Brady

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