Hello ,
We understand you have a question regarding the indispensable tool referred to in our Pompeii eBook.
We have attached a photo for your convenience. This unit is designed to support up to a 42" cooking surface.
As you can see from the picture the tool is adjustable as you move up the surface of you dome construction.
Have Fun!
Forno Bravo.
How do attach and level oven to stone base I have built?