A Brewmonkey special! At bottling time, syphon your cleared beer into this bucket (sterilised first) and dissolve all the priming sugar at once before dispensing into your bottles with the attached bottling stick. Mix well to ensure that the sugar is evenly distributed and then you should get the same level of carbonation in every bottle.
When the valve at the end of the stick touches the bottom of the bottle it releases the beer. When the bottle is full take the bottle away and the flow stops. simple!