While changing carbs on my built 390 we noticed that the harmonic balancer was showing wear. It was wobbling. Attempted to find a OEM replacement. Unable to do so and didn't want any junkyard gamble. I ordered a Street Damper form CNC. The crankshaft fit was good but the overall diameter of the damper was too big about 1/4 to1/2 in. Has anyone had this problem and if so what's the fix?