We always had a "Primitive Pete" in the shop. They showed these videos in high school shop and trade school. There are several in the series if I remember correctly
Don't be a Primitive Pete when working on your airguns!
https://www.youtube.com/watch?v=sKM4qBESzrA
Don't be a Primitive Pete when working on your airguns!
https://www.youtube.com/watch?v=sKM4qBESzrA