On my Pfaff 332 you can adjust the pressure on the presser foot, but it has to be done with a screwdriver. On mine, the procedure is to remove the top and using a wide screwdriver turn the screw at the top of the presser bar counter-clockwise to decrease the pressure and clockwise to increase it. The instructions say that the top of the bar should be level with the casing for general sewing. The smallest turn of the screw will have an effect, if memory serves 1/8 inch maybe as little as 1/16 of an inch below the top of the casing is all that's recommended, and again, if memory serves, that much or less above the casing.