Summary

My son heard that there were bad guys who were going to hold up our train on the Grand Canyon Railway and he wanted to make some handcuffs to arrest them. I found this project on Youtube that made them out of cardboard.  I used the file to cut some 3mm basswood plywood and it worked. 
Instructions: https://www.youtube.com/watch?v=RPjzT-p3v7s
Files from creator: https://drive.google.com/drive/folders/1pOdMZZg8cDKXCUVSDQjSWpbs8HfL9KkN