thumbshifter SL-M700 question

stumpjumper1990

Retrobike Rider
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Hi all,

I got three pair of these nice thumbshifters. The only problem is that the tend to slide out of gear. The part that should prevend this is a small spring with a T-shaped top. Once this T-shaped top is worn, it's allmost impossible to use the shifter anymore.
I'm looking for a replacement for these tops. Can anybody help me with a sollution?

Here's some more info on these shifters: http://www.trek4fun.com/mountain_biking ... levers.htm

Thanks,
Bart
 
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