Assistant tool for calibration.....I made this, not pretty, but usable!:-!
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Found,yes it's a 20mm shirt button :-dLooks like a smart setup - I would guess a 20mm shirt button with 2 holes for the wires and one 'cut' for access to the calibration part ... :-!
The nominations. Wires= redlus, black:minuscontact points are not where the wires in the button are, if we look at the picture in the manual
how do you know where to fix them
The final version, mirror the process followed. Thus, the perfect :-!Assistant tool for calibration.....I made this, not pretty, but usable!:-!