Hi, Tomb.
I really wouldn’t know. Some sources suggest all 550 down tubes have a perceptible flattening at the headstock/downtube junction socket. I guess I’m totally reliant on the opinions and observations of other 550 owners. Perhaps they all came out of the factory like this Sir....ahem.
Using a crude straight edge, headstock cones/rod and builders level, everything seems to line up with reasonable accuracy. I guess I may be worried about nothing, unless somebody says different.
Thanks.