Originally Posted by
M4tt3
I am thinking of adding a washer to move the derailleur slightly towards the wheel to see if I can index it then.
I can't imagine how adding a washer could move the RD
towards the wheel.
Originally Posted by
Barry2
New hangers are not always straight when mounted to your frame.
Have the hanger alignment (re)checked.
Barry's suggestion is likely spot-on. New derailleur hangars often need to be aligned upon installation.
Since your mechanic couldn't straighten it out, you probably need a new mechanic.