The spirit level verifying the transverse orientation of the 3-D H machine is brought to the horizontal by readjustment of the seat pan if necessary, or by adjusting the leg and foot assemblies towards the rear.
3-DH-aparaadi ristkaldelood seatakse horisontaalseks, reguleerides vajadusel uuesti istmikuosa või seades jalalaba- ja sääreosi tahapoole.