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Here is a math solution for your problem.The dampener is in most cases 7.25 inches across.You multiply it by 3.1416 which is pie for find the circumfrance of a circle which equals 22.8085.Take this and divide it by 360:22.8085/360=0.063.this means that every 0.063 inches equals 1 degree.Then 45 degrees is equal to 2.835 inches,90 degrees would be twice that or 5.67 inches from TDC,Mrmopartech