The down side of the 1/2" drive to me is it is not a one fits all such as the cone. I run the 3" cone and have two inserts, one insert fits 3" and up spinners, and one that fits 2" and smaller with the opposing side flat for non spinner apps. I can start any engine up to at least 150cc with any prop set-up. It has been the simplest solution for me, others may vary.