I love 1940s/1950s instruction videos. Here’s one from Hamilton that shows how they work that I really like. https://www.youtube.com/watch?v=rL0_vOw6eCc https:/

I love 1940s/1950s instruction videos. Here’s one from Hamilton that shows how they work that I really like. https://www.youtube.com/watch?v=rL0_vOw6eCc https://www.youtube.com/watch?v=rL0_vOw6eCc