Can't seem to perfectly sync two clips...

I'm working with a split screen effect, with each side of the screen showing a different angle of the same, simultaneous action.  I'm trying to line them up perfectly (using the audio), but can't seem to.
The video shows a hammer hitting nails, so there are very distinct audio peaks that I would think I should be able to use to line up the clips exactly.  But I find that, even trying to just nudge the clips back and forth, the sound is always slightly off.  When the hammer strikes, I hear it strike twice each time, very close together, but definitely not exact.
I don't know what to do about this.  Is there a way to line it up exactly?  If not, how do you handle this?

Okay, I can see how either would help.
That nudging the audio in subframe increments sounds interesting.  Do you do that by detaching the audio?
I guess you can't nudge an entire clip by subframe increments because a frame is a frame?

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