Okay, I've got one here in front of me. If you put too small of an allen key in it then it will just poke right through (I guess the adjuster is hollow) so use the biggest allen key that will fit in the hole and it is about 3/4 of an inch deep in the hole (instead of 1/2" like I stated earlier).
BTW, it's got MOTORCRAFT cast into it so it's definitely stock.
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