Old 02-26-09, 11:13 AM
  #3  
Banzai
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Join Date: Jul 2005
Location: St. Paul, MN
Posts: 4,909

Bikes: Cannondale CAAD9, Ritchey Breakaway Cross, Nashbar X-frame bike, Bike Friday Haul-a-Day, Surly Pugsley.

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The "auto-trim" isn't flawed at all. Sheldon had it wrong. If you observe closely, it doesn't turn the lever, it actually, in effect, movest the post or boss that the lever is attached to in order to alter cable pull. The key to making this work right is to set up the front cable tension at the relaxed/most inboard setting while the rear derailer is on the largest cog.

Sheldon argued that after enough "turns" of the lever, you had to set up again since it only trimmed one way. Unfortunately, he was in error, and if you set up like I have outlined above, your bottom trim is exactly where it should be, and there's no issue with "creep" in this system.

Reassembly? Ho ho ho.

I've tried this too. Here's how I resolved it.

1) Take apart shifters to clean. Be meticulous about laying out the parts in such a way that they can be re-assembled.

2) Attempt to re-assemble. Realize that even with your careful efforts, you can't make it work.

3) Go to C&V on bikeforums looking for help.

4) Go to e-bay and find another symmetric shifter for around $15.
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