Yep, I read that in my Jobst book. I am a bit reluctant to tighten to deformation though. I did that once however and had no bad results. I know manufacturers might give readings in general. I was just trying to decipher any rhyme or reason to it. For example my miyata has Ukia single walled rims with no eyelets, while others like some Wolber I have are box rims with eyelets. Many other varieties too. Since everything is old, I don’t go real tight, and as you suggest, I compare to ones that a bike shop did for a cautious upper limit. Maybe if I put thousands of miles on each bike, I would break some spokes, but I don’t currently with my bikes.