Just had a minor brain wave. Took out 3 screws as suggested so that I could move the plastic case around to make sure that was not binding. Then I worked my way through the comprehensive set of unusual/security screw bits in my Draper set to see if another type of bit would fit well enough into the hole to grip. Somewhat to my surprise a hex head fitted well enough to give a bit of grip and the screw is now out!
This attempt was prompted by the suggestions, including rubber bands, to provide a little bit of extra friction. So those ideas are as yet untested.
Now to put it back with 3 screws and then find another screw to fit from my collection of small screws.
Then (eventually) to build a file server.
As an aside I have been talking about upgrading my graphics card on my daily driver to enable reliable 4k display support.
The current card may well do nicely in a PCIe slot in the server.
The head was stripped, but as soon as I managed to get a screwdriver bit to get a little purchase it came out very easily. No sign of over tightening as the plastic caddy would rotate. A bit of a puzzle, really.
Almost as if the screw was damaged before it was screwed in. This assumes that there was enough purchase by a screwdriver to spin it in against no resistance but to cam out as soon as the screw tightened up a bit.
The replacement screw with a smaller head diameter went in easily so the thread seems OK.
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