Being a Bernina owner with a knee lift I regularly use my left foot on the pedal. My serger requires the right. I have my pedal on a rubber mat to help keep it from sliding forward. I also have a plastic box the same height as the pedal that I rest my non sewing foot on. That allows me to keep my body equally aligned. Having arthritis in my back and having been a quilter and sewer for more than 50 years makes any little aid a real necessity.