This is the way I did mine,,I milled the cap's and then milled the spotface (where the main stud's are) on all to a determined height then made hardened spacer's to fit the spot face at a thickness that gave a .005-.006 preload on the center of the cap, my machinist saw how they said to do it an agreed highly that the way I did it was far superior to their way of using a stack of hardened shim's to get the preload.