Blueprints On How To Build A Table For The Big Green Egg Having Trouble With My Trebuchet. HELP!!!?

Having trouble with my trebuchet. HELP!!!? - blueprints on how to build a table for the big green egg

I built a tabletop trebuchet, so its only 1 1 / 2 feet high. I built everything according to plan, but somehow pulled a golf ball is released too early or too late. I think it has something to do with the scarf. HELP