I have a 80's bike (Limongi) whose fork diameter where the crown race would sit is 26.65 - 26.67mm according to my calipers (I measured carefully in a few spots). LBS told me that this was Italian standard and I bought a Campy Record headset for them to install. The crown race broke. The LBS said they'd get back to me with a solution next week.

In the meantime I'm losing trust that they'll do the right (safe) thing. I don't want whatever crown race they find and install to snap while doing a 70 km/h decent.

Do any pro mechanics have any advice?