http://www.scatcrankshafts.com/scatt...k_the_Nose.pdf
After you have watched that video, check out number 5 of this page---in the video look at all the holes he drilled into the counter weights to try to balance the assy with external weighed flywheel and dampner--In Scat's tech section in very plain language talk about how much to drill and this guy evidently didn't read it--