Replacement Wheel Stud - Front Problem

Badawg said

I had the EXACT SAME problem with mine and had to tack them in. What a pain in a$$ it was for something that should have taken all of 5 minutes to complete

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I've seen them tacked before, and never understood why. Still dont understand fully.

When you tacked them in, you tacked them to the Drum, The bearing hub, or both?