... All you have to do is to insert the R-K key into the lock plug and right turn 90 ... then pull the plug out TOGETHER WITH R-K key.Replacing a new R-K key and align tumblers flush to ... horizon,pushing the plug back with R-K key ,left turn 90°,andremove the R-K key out.One transcendent ,economical ... cylinder.World-wide patent LsL lock,the easiest R-K system when required,perfect for organizations with high ...