For the Guteneers, this is what I do, you don't have to do the same or agree just some ideas.
I made a video of the emptying if I can load it I shall.
Brewing a 23 litre batch of Best Bitter no sparge method.
Helix coil in position
32 litres of liquor, the silicone tube is to prevent an exodus of grain through the handle holes, the bazooka is mounted on the top of the overflow pipe.
End of mash.
The bazooka with some silicone tube inserted on the inside, this means the liquor has to go over the top of the tube though I haven't found any difference in pre boil gravity using the overflow and not.
Vigorous boil
The hood cheap and easy to make after a visit to a Chinese cooking utensil shop help keeps the heat in.
After emptying, took approximately 2.5 mins to empty.
Well I reckon that just about nailed the 23 litres
Tried to insert the video would not go on, will have to work on it and add it later.