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I should have paid more attention when ordering those other two optical drive bay adaptors: turns out they're 12.7mm deep as opposed to the 9.5mm adaptors I've had before. I imagine they're cheap because this thick size is less easy to sell… Anyway, such an amateur mistake…
I tried to fit one into the müllered T410 (reasoning that a HDD would be more useful than an optical drive, and I have an external optical drive anyway) but it was too chonky. Can I fit one in PavNAS and put the slim adaptor in the T410? Nope; still too phat.
I had a brainwave and remembered all the many, many other places where I've used these adaptors; one of these is in the ancient Lenovo IdeaCentre AIO. Took it apart and found there was plenty of room to fit a deeper adaptor in (bonus: it works!), so that's one slim adaptor recovered.
One of the old desktops (former "NAS", former LRPC (Living Room PC)) is also fitted with an adaptor (one of the reasons I managed to squeeze four hard-drives into that slim case…). This too looks to be able to fit a phat adaptor, so that's two slim adaptors recovered. I like to have spare of these handy as they are hyper-useful.
This is like a puzzle adventure game!