Principle of action
Chair seat is swinging on a back axle. Body weight is compensated by front legs springs, allowing free swinging on a seat without extra force. The motion of seat transforms by lever mechanism to the dildo, that has two times bigger counterstroke. While seat swing is appr.~ 5-7cm (2"-2.5"), the stroke of dildo is up to 20cm(8"). Stroke and frequency is chosen personally by intensity of swinging (version without motor). The motor version lifts seat automatically with frequency 60 - 120 RPM.