Monthly Build Challenges: "Mechanisms" - Concept Brainstorming

Hello again everyone! The most common suggestion from all of you regarding the contests or challenges you would like to see was about cool mechanisms that could solve some of your issues in your builds and could also elevate your Lego Technic knowledge. My current idea is the following: Each month, we would announce a challenge to build a mechanism of some type. Your entries would have to be unique while fulfilling the mechanism's purpose At the end of the month, the best entries would be...