https://www.instructables.com/3-Ft-Hanging-Counterweight-Trebuchet/
3 Ft Hanging Counterweight Trebuchet : 7 Steps - Instructables
3 Ft Hanging Counterweight Trebuchet: In This how-to essay you will learn how to build, adjust, and fire a trebuchet. Trebuchets were first used in the 4th...
3 ftcounterweight trebuchet7 stepshanginginstructables