You are a legend for finding those for me- I enjoy fixing things that are “not repairable”.
Unfortunately my MacBook Pro recently failed, was told it was a logic board failure (which it is) but I have managed to force one graphics card as it has dual to not work and am finally at the boot screen!
The previous 2010 model I was told the same, it took me a long time but by removing the PLIST model identifier I got it working. I had to install my own fan controllers etc as it no longer recognised it was that model of computer, but that one is still working.
Hmm the size. It is very small, as in the smallest Allen key in a whole set kind of size. Maybe if I measured across(I would say 1MM at most anyway) I can convert it to that size?
I’m so happy you have made my day mate