Ive recently applied 8 grams of lead onto my racquet. I placed 4 grams on 3&9 o'clock. But my question Is where to put the lead and also the amount needed. I know there is a thread/equation to solve this, but im quite confused over it. The racquet I use is the HEAD Youtek Speed 315 16x19 My reason for applying lead was to increase plow through against hard hitters. Thank you for the help.