they just one to do easy job n charge high price. U used chamber nuts, ur forcing  the chamber to change from original spec, and it become out if spec. Unless u r going for racing on track,they used adjustable damper come with adjustable chamber which come with the damper itself,to suit with track condition.

The correct adjustment for chamber is using compression method using special tools, it just needed if u involve in accident or ur car more than 10 years old and been abused badly, that make the chamber out of spec.

Just check whether they used specific software for ur cars, normally just cedok all cars setting,some times wira for all prtn cars,even same type of cars,example city 2005,with city transformer, they are having diff chamber setting.

So,what actually they show u r totally wrong,they just playing with computer figure to con u.