I did this !!! Many thanks to Sam and iFixit, as the mini was pretty well unusable with its original HDD after upgrading to High Sierra. I replaced it with a Crucial MX300 SSD and it now purrs quite happily. My only bodge was to use a bit of welding rod bent to shape as the logic board lever tool.
I formatted the SSD to a GUID partition map first of course then fitted it and ran the High Sierra upgrade which updates to APFS… blah blah blah but you know it makes sense.
Thanks again iFixit and Sam Lionheart
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