For the Avistar, the builders manual says the CG is 3 1/4 inches back from the LE. So I would say that if what cappio777 said about going anywhere from behind the firewall to at least 1 inch ahead of CG, this would mean centering the dural apparatus at 2 1/4 inches back from the leading edge........Hmmmmmmmm.............

Sounds good to me....................