#1
Since the frets of my SG are a little bowed, when I misure the action, I've to do it between the height of THE OUTER EDGE of the fret and the lower part of the string, or between the point where the string actually touches the fret (which is 1/2mm higher due to the bowed frets) and the string? Thank you very much for the help!
#2
To the point where they touch the frets when pressed vertically downward.

Not sure what you mean by 'bowed' frets. The frets should normally follow the natural radius of the fretboard
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#3
yeah, I mean exactly that! just I'm italian and I didn't know exactly how to say it xD.... thanks!!!