Dubro Tru Spin Prop Balancer DB499Description Du Bro's Tru Spin Prop Balancer is the most precise balancer on the market. Our NEW specially designed locking cone securely centers and locks props on to the balancing shaft for utmost accuracy. Each cone is carefully inspected on a calibrator to make sure it is running true. The balancing shaft is manufactured out of hardened material and then is centerless ground giving precision balance every time. The prop balancer's aluminum wheels