I had the last 14.4mm screw strip on my 2012MBP case (commence cursing….)
I tried the rubber band trick and different drivers, but after reading merryladyj’s glue gun idea, I took a modified approach and used a soldering iron with a clean tip. It took a few tries, each time increasing how long the iron was in contact with the screwhead, and using a 3/64th” flathead to get a grip on the screw. It worked great, and the cursing stopped :)
The stripped screw had 2-3x as much locktite as the ones that came out easily so I’m guessing that was the cause.
Hope this helps :)
K