Mason Jar Mouse Trap

I've caught a lot of mice with my earlier version of this trap, designed for Adam's peanut butter jars. (We eat a lot of peanut butter.) I've even caught two mice at the same time. This version is designed for standard 32oz (or standard 1 liter) wide-mouth mason jars. It consists of a weighted ramp that tilts down to let the mouse into the jar, but when it tilts back up, it blocks the exit and has no features for the mouse to grab onto to open it back up. Just smear a little bit of peanut butter