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in my opinion what is written in the monograph must be taken into account and then checked on the drawings, the thumb is 27.070, I don't have the monograph I reserve the right to make observationsHello Tobias,
My apology for asking again, but I still guess that the keelson is 7.50 mm wide and not 6.95 mm.
Statement from the monograph:
View attachment 365047
On plan 7 it looks like that the part you are measuring in the picture above is slightly smaller than the keelson:
View attachment 365048
Measurements from plan 11:
View attachment 365049
View attachment 365050
Please see also the cross section of frame 30 on plan 11 for the different dimension of the keelson and the part with 6.95 mm width
View attachment 365051