Somebody knows... Maybe you?
As the Parts are 3D printed ... that should be a simple fix, the PLA plastic melts at around 150 deg C,
so, using a hair dryer of heat gun, you can gently heat up the wheels so they become flexible and then using a cloth ... push them against the metal back ... when they cool they should stay flush to the back plate
hope this helps
I was hoping others may have been able to post pictures. However, he was able to refit parts, as factory supplied, through a pm message yesterday. I did however, this morning, find in my spares drawer the flagged up parts, so to clean up the thread, I've posted pictures below. The two 3 hole items attach below the coin entry plate, and the 2 hole item sits inside one of the coin reject parts.