The working surface is not 100% level, the test can be easy if you einspannt- a bent wire in the machine which then grinds on one page- at 15cm circumference about 1mm difference, not little. Since I am not Wegschmeisskultur-operators, I just on a trimmable wood panel mounted at the correct angle. Advantage: it is easy practical guide rails can be mounted. If the stand restarted well, the rack leaves a strong impression, however, lowering the wheel is at the top of tough as below.
