O ok, i tought that most calibration issues where due to bending of the top beam.
And when portable then you have a top beam made of 3 or for pieces, hen you need some kind of construction that can handle these things.
What i can’t find the thread where there was talk about 30kg forces bending the top beam and causing the calibration to be off.
I’ll try to hunt it down and paste the link here once i find it.