Connect the end of the whirlpool paddle into an 8mm (1/3”) or larger drill chuck.
Insert the paddle into the wort, start drilling slowly to turn it. 
It is best if the wort has cooled before increasing the speed.
Use the drill at a higher speed setting to aerate the wort and create a whirlpool inside your boiler. 
Note: Do not insert the paddle all the way into the Grainfather boiler as it is possible to displace the filter on the bottom of the boiler.