We use Shock Absorbers in our products. Today we use "FESTO YSR-16-20-C" or "WEFORMA WS-M 0,5x19 - 4HA". It′s important with the same size! Threaded outside: M22x1,5mm. Stoke: 19-25mm Sleeve: diameter 16mm Kinetic energy: min 80Nm Annual consuption: 500-1000pcs/year Please offer with price and freight to Sweden.