The CG came out at 3/16" fwd of the recomended CG. I had an old 3 1/2 " TruTurn Backing Plate that works but the prop is still nicked pretty hard. I never had a spinner do that before but the LHS acts like it's comon knowledge. Hmmm, I never had this problem before but I see that even the beefy old one distorts when I tighten it up so; not so tight, eh! I guess you never stop learning. I had to laugh, when I tried to put the old "Acu-Throw" on the stab it didn't even get close to being deep enough to clear the elevator! Forget the rudder, maybe on the ailerons.