Missing a black square on the early model CPC keyboard.

[FD]

Just been fixing up a 464 - but the last piece of the puzzle is to fix a broken escape key - well - I have the key and plunger but not the black square that it sits in. The black square piece with the hole for plunger. I tried to make my own version using a spring/washer and some glue but you need to have a cavity for the key to go up and down...
I don't know if anyone has overcome this problem - or has a part, 3d print version, that I could buy from them?You cannot view this attachment. I am in Australia...
Thanks in advance.