How do you rebuild all thumbnails?

I read in this forum that the latest update would reduce the size of the thumbnails directory and in some cases even quite a lot. My thumbnails directory is 9GB for 10,000 pictures so I figured I would give it a shot.
Only I can't figure out how to rebuild all thumbnails. I googled but didn't find anything related to thumbnails.
I did try however, to select all pictures and "update previews" - it took a few hours, but my "thumbnails" folder in the "Aperture Library" package remains the same.

This is almost worth a sticky... I had the same experience: rebuilt thumbnails, and was surprised that the new size was exactly the same (and Aperture chewed for a long time, so something was going on, and drilling into the library showed that the thumbnails had indeed been "updated.") Was only when I trashed the thumbnails and let it go to work the next time I opened the library that I noticed a decline -- in my case, almost exactly 50%.
Finally figured out that was the way to go on my own as well. My formerly 50GB library of ~71,000 images has now become a much leaner 28GB after trashing the thumbnail file and rebuilding from scratch (although it took about 28 hours for the full rebuild.
Well worth it however.

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