Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Don't blame the spring, it's just being a spring.
The spring's pull is constant, you pull the cable to shift and let it go and the spring shifts back. It's a latching mechanism in the lever that holds the cable against the spring. So look to the lever for the solution. It could be dead, or (if you're lucky) gummed up with dried grease or dirt, so the latching mechanism doesn't engage right. Sometimes the levers respond to being blasted with WD-40 or the like to flush out any gunk, then dried, and oiled with a light oil.
You have nothing to lose except the cost of the solvent, so give it a shot. Otherwise start shopping for a replacement lever.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance