My first Masi GC, bought new in 1972 with full Campy Record components, developed that brinelling surprisingly quickly with the supplied caged bearings - I’d guess within about 1500 miles (but we didn’t have odometers and GPS back then). For what was the “best of the best”, I was quite disappointed. The shop where I purchased it switched to loose balls to eliminate the indexing for the remainder of the time I owned that bike, maybe another 3000-4000 miles. Headsets have improved substantially since then.

I’d strongly suggest switching to something with sealed bearings, doesn’t have to be expensive. My Shimano Ultegra version on the Miyata 912 is working fine after well over twice that mileage. And shop labor to install it shouldn’t be much.

A Fuso, any Fuso, is worth it!