Here comes the promised update. I decided to open a new thread about the new calibration and dimensional accuracy (see Feedback on calibration and resulting dimensional accuracy). The conclusion for this topic is that my first attempt to use single 8mm bolts as anchor points was too weak. My new anchors are wooden blocks (40mm high) bolted to the concrete, with a 10mm hole where I can drop a M10 bolt in to attach the belt. These anchors seem to work very well:
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