I would like to create the cone as you can see here
First, I would like to know how to create the cone with 1mm of thickness.
But, once done, I will ask a locksmith to solder the plate of 1mm of thicjness, which is not a rectangle as at the end, the locksmith will curve the plate and solder the two extrimity to have a cone.
Then when the cone is done, how can now the dimension of the plate for the locksmith.
I do not know exactely how we said that in english. For me a locksmith is the man who work with metal structure.
Many thanks for your help