There is no special rigidity of fastening the saw to the sole. For accurate cutting (accuracy above +/-1mm), you have to use a caliper to check the parallelism of the disk to the sole and, if necessary, “bend” the rear hinge. I don't know, maybe I'm picking on this and this saw is not designed for jewelry work, but I work in furniture and I need this accuracy. In general, getting into +/-1mm is not so difficult, and with some skill you can cut +/-0.5mm.