I guess my fitting pins point is that obviously this has happened before from previous posts today.
That red flags the fact that recognizing two pin sizes are incompatible is not always easy and obvious or it would not have happened like it did on the non accident aircraft.
3 pins, 3 holes. 2 pins fit all 3 holes, one pin does not. Looks like an opportunity to make mistakes if you have extra pins on the bench and not just the 3 original.
Time for safety engineers to design more incompatibility into those pins.... shape, colour, who cares but fill the gap we are slipping through. Probably costs very little at the parts fabrication stage.