Seems to me most I've found need a bit of tapping to get them back into place. I'm sorry if I made it sound like anyone should attempt to force it snug to that screw head...you shouldn't do that...but it does act as a stop to some degree for a loosely fitting wedge I would think.
The important thing is to have it not fall out, while bringing it tight (or loose) enough for the proper gap.
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