Input jack fix part 1.
Time to get serious. Out come the digital callipers.
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So, 12mm drill bit from the control cavity side.
Using very little force, letting the drill do the work, the bit easily follows the path of least resistance and widens the hole just enough.
Hooray, it fits! First step down.
Here's what I'm dealing with for the second step.
instead of widening the hole in the body, which I originally thought I'd need to do, I realised I could make the rim of the jack itself smaller. Much more straightforward and if I stuffed it up much easier to recover from.
Using a disc sander, I very carefully ground about 1mm off the edge. Alternatively, this would be possible using a file or even course sand paper. After that a quick squirt of black paint to ensure no future rust and....
It's in! Happy dance time!