Yup, glad you caught that. The polylock nut/setscrew needs to be tightened together to properly lock against the top of the rocker stud. 1/2 turn on a 7/16 stud is usually .050" of preload, which should be good unless they are short travel lifters.
I usually set the 1/2 turn, then tighten the setscrew lightly against the stud. Then turn the box wrench and allen wrench together. Usually ends up a little more than 1/2 turn of preload once you cinch it all down.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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