You've got compact cranks, no? 50t is the largest you'll get on 110pcd.
Speak to your friendly, local framebuilder: as the mount-to-BB distance seems to be standard, my guess is that the move back to band-on FD was prompted by the introduction of compact chainsets....
Personally, I wouldn't bodge some sort of extension; you know how it is: FD always throw themselves into your chainring at *the *most inconvenient times.
As filing the mount isn't practical, I would go for having it removed: should be a quick, cheap job.
You've got compact cranks, no? 50t is the largest you'll get on 110pcd.
Speak to your friendly, local framebuilder: as the mount-to-BB distance seems to be standard, my guess is that the move back to band-on FD was prompted by the introduction of compact chainsets....
Personally, I wouldn't bodge some sort of extension; you know how it is: FD always throw themselves into your chainring at *the *most inconvenient times.
As filing the mount isn't practical, I would go for having it removed: should be a quick, cheap job.