Alga has it spot on. I have attached a (very) quick sketch of a die, dimension A denotes the length of pipe required to make the flare.
Put the pipe in the clamp loosely.
Place the die next to the pipe upside down, sitting on the face of the clamp.
Line up the top of the pipe with the height of the bottom step of the die.
Tighten the clamp.
Just a quick note, the longer end of the clamp is to allow you to mount it in a vice, it's then much easier to keep everything square as you form the flare.
I use the same machine mart set as Ash, I had it before I started my build and have used it to make several brake pipes for my cars over the years. Worth it's weight in gold.
Hope all this helps.
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