The issue is that one end housing has the insert, the other enddoesn't. At this point, I think my best option is to dig the insert out of the rear housing, and make it look like the front.George, I believe the number for the variable runner to engage is 4,000RPM.--http://www.ronpaultimeline.com --Homepage: http://www.flyrotary.com/Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html