I've been fascinated by mechanical watches for years. It can become a deep rabbit hole (like most hobbies). I frequently have watch restoration videos playing in the background as I'm doing things and love the process of taking apart, cleaning, and reassembling these watch movements. Wristwatch Revival is probably my favorite. I has encouraged me to tear apart a few watches of my own to give them a good service. As complex as they look, most follow a very similar process to rebuild.