How does a manufacturer produce air spring suspension parts aluminum piston？

This video is to show how does a manufacturer produce air spring suspension aluminum piston(Air Spring Repair Parts, Inside aloy piston in the airmatic shock Absorber strut for luxury passenger cars like Mercedes Benz, BMW, Audi , Land Rover, Porsche and other cars). #replacestrut #repairsuspension #airsuspension #suspensionstrut #airshockabsorber #airdamper #airsuspensionshock #suspensionshockabsorber #пневмоподвеска #suspensiondeaire #luftfederung #въздушноокачване #zawieszeniepneumatyczne #suspensãoaar #подвеска #vzduchoveodpruzeni #luftaffjedring #pneumatinepakaba #airshocks #airsuspensionshockabsorber #topdead #airstrut #pneumatic #airmatic #airmaticshock #airmaticsuspension