*edit title: ...shifter only shifts once...*
I'm rebuilding an '04 Giant OCR 3. It's got the Sora groupset.
derailleur- Front: Shimano Sora, Rear: Shimano Sora
derailleurshifters- Shimano Sora,STI, 8 speed
cranks- TruVativ Touro, 30/42/52T
When I got the bike, the front derailleur wouldn't shift. I found both adjusting screws tightened all the way in. I've backed them out, and they now shift. However, it goes from small inner ring gear to large outer ring gear in one click. I push the thumb lever once, and it pops back to the small gear. I can then only push the shifter lever to shift back up (down?) once. Then it won't shift anymore.
I've checked the shifter and it says "triple" right on it. There are no such markings on the front derailleur, but I can't find any visual difference between a double and a triple on the internet.
Was my front derailleur swapped out from a triple to a double? or am I just an idiot and somehow messed up some adjustment?
Details on '04 OCR 3: http://archive.giant-bicycles.com/us...04&model=10875
Details on what work I've done on the bike: http://back2dabike.wordpress.com
Thanks for your help!