HF leakdown test is a Piece of Big Steenkeeng SHTUFF but here is

jos51700 said
You might be able to make that work, but why?

Why not? Most of it is there, all it needs is one 100psi gauge which is there, and the proper orifice. A Matco is 160 bucks

If you have a better idea, "bang for the buck" by all means let's hear it