Donny Petersen has been following this problem for several years. The Feb issue of AI really tracks the band aid efforts made by HD to correct this supposed aesthetic problem. From the cush drive, to the SE Comp to finally a helical cut 5th. The 6 speed was introduced in a limited fashion in 2006 but the problem didn't develop until it became a standard fit in 2007. Interesting that Baker introduced a fix shortly after the problem became known. Interesting read.