Resynchronize Audio to Video
This does it for me (see the screenshots):


Set the cursor to the beginning of the audio event.
Drag the beginning of the audio event with the mouse to the beginning of the original clip (note: the cursor is still positioned at the cropped beginning) (screenshot 2)
Cut the audio event at cursor position (press S)
Repeat step 1 to 3 with the video event (screenshot 3)
Now you can easily synchronize video and audio by aligning the events (screenshot 4)
Delete the beginnings. (screenshot 5)