My guess is because the handle isn’t glued/epoxied and there are expansion rate differentials between the materials, heat cycles allow things to creep in there slowly and get stuck. Maybe the scale bows slightly when it gets warm because tolerances on the pins are so tight. Maybe it’s just the inevitable differences in the flatness of the surfaces.
I’m not a materials scientist though. I am happy to see someone else publicly corroborate my rust experience which I’ve been on about for like two years while mostly everyone has been giving me the
Here is some more thread jacking.
View attachment 906019
View attachment 906018