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I have this simple Robofab script here that adjust the height of accents above glyphs.
I'm sure there are better ways of doing this but I like this method.
from robofab.world import CurrentFont
f = CurrentFont()
glyphs = [
for g in glyphs:
f[g].mark = 10
If I use this on a MM font it will adjust the height of the accents in both masters.
Is it possible it adjust the height in just one of the masters.