I was an Acoustat dealer for many years and currently run a pair of 2+2’s that have been completely updated/upgraded.
Could you post pics of what you have? It depends on what model of electronic interfaces you have. The pin should plug into the top of the board that has the female hole on it. Could be this broke off, if not there. Pretty easy to see, it’s in the middle of the two thumb screws that the other (2) groups of wires hook to...those are the ones that you say the wires pulled away from. They are actually hooks, not spades.
I also have the manual if needed.
You might what to check out The Acoustat Answer Man. Andy is just GREAT!
https://www.diyaudio.com/community/threads/acoustat-answer-man-is-here.183168/
LOTS of really good info there!