How can I retrieve Aperture Previews and Thumbnails directly after a corrupt hard drive corrupted Masters?

I have several old albums where JPG's were apparently corrupted on an old striped RAID.
Aperture still shows the previews (quite large, thankfully) for these old images.
But when Aperture tries to refresh the preview, the previews mimic the corrupt masters.  To stop the bleeding, so to speak, I renamed my Master directory so Aperture doesn't update previews for these corrupt JPGs.  However, I'd really like to save these previews, even if not at full resolution. Some folders
How can I retrieve Aperture Previews and Thumbnails for these items?
My process so far:
1) Show package contents on Aperture Library.
2) Navigate to Previews
     - some directories are here, some are missing
     - for those that are here, back up elsewhere and mission accomplished
     - for those that are missing, try to recover the thumbnails at least...
3) Navigate to Thumbnails
     - Lots more directories here. Likely the ones I'm looking for. (but they have strange hash names, so it's hard to say)
     - BUT, they only show large "AP.Thumbnails" files, no separate image file
The big answer I'm looking for... How to recover images missing from Preview directory and/or AP.Thumbnails files? (short of taking screenshots)

It would be nice to know your Aperture and OS version, there have been changes over the years.
The big answer I'm looking for... How to recover images missing from Preview directory and/or AP.Thumbnails files? (short of taking screenshots)
If you open the library in Aperture you can drag the preview images out of the browser and place them in a folder on your HD.  If you cannot open the library then you will have to resort to going into the library package and rooting around.  There was a big  change with the library layout from Aperture 2 to 3 so knowing the version would really help here.
regards

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