... do is to insert the R-K key into the lock plug and right turn 90 to stop postion,then pul ... do is to insert the R-K key into the lock plug and right turn 90 ° to stop postion,then pull ... ,economical new code set of operating key to the lock is made ,instead of changing one whole set cylinder. ... World-wide patent LsL lock,the easiest R-K system when required,perfect for ...