Cathar, with that amazing precision parts your machinists can make; having to align the final assembly by eye seems a missuse of your resources. You could design some type of aligning feature on the lower face of the middle plate, that precicely match another one carved on the copper base. This could add some machinning time to your current design, but it will ensure a perfect centering of the jets every time. Once you switch to molded parts, this features comes almost for free.
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