Campagnolo Chorus 12s upper pulley adjustment problem
 

Hi
Im using campagnolo Chorus 12s last 2 years with no problems at all. (32-48 with 11-34)
Suddenly the upper pulley of rear mech started touching the 34 cog badly. I screwed in the small screw so much, until it was almost out to go back home.
I changed the wire and re adjusted But nothing changed.
Has anybody experienced simething like that?