Attach the spring system is a machine for pressing the needle down.Attach the rubber skin exposed, untilPress the rubber surface with rubber cover 3 points, and then note the value.
Air spring system is attached to the pin into contact with the skin attached to the rubber surface with rubber. To press the rubber cover three points. Save the
By attaching machine spring system is press needle down.To attach contact with rubber skinWith the rubber surface, rubber press both bury 3 points, and then save the value.