I measured the rod ends and was sorely disappointed. Pressed the pistons off and went to the machine shop where I used to build the Hot Rod Harley engines.
Resized the big ends.
Back to my shop. Pressed the pins back in and have 4 in the holes. 4 to go.
I showed the young man I am building this for and all he could say was.....that looks awfully dirty........Oil dip nozzle....that is oil.........
I bet these new fangled piston engines are a bit more complicated than the steam engines you worked on as a youngster.