Not Ranked
The rocker nut should sit in the machined recess in the pivot shaft stud hole.
Also the rods do have to be the hardened variety if you use any type of guideplate. The wear marks on the top of the valve indicate to me that the pushrods could be a fraction shorter to move that wear mark exactly in the middle of the stem.. But if you have cheap studs they are going to break.
John
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