I am attempting to mount the vertical stab to the horizontal and the rear F712 and I can't seem to find where there is an actual measurement to go by on the front spar. I realize that there is a 1/4" joggle in the F718 and it must be ablsolutely vertical to the horizontal stab. but the height of the vertical is what I can't seem to find. I did use the print to locate the rear vertical stab spar on the F712 but that seems to lower the front almost too much when the rudder hinges are straight. Does anyone have a dimension or advice. Thanks.