On the vertical and horizontal stab, draw two lines starting at the screw hole and extending out 1.75" to 2.5", angle should be between 30° and 45°. Now lay the empennage fairing in place, tape it down, etc. Now re-draw the two lines on the fairing, the intersection will be the location of the hole in the VS and HS.
Retired Firmware Guy and Airplane Builder
2018 RV-7 QB -- Built, Flying
2007 RV-7 QB -- Built, Drowned, Resurrected and flying
1998 RV-8 QB -- Started, Sold
1986 Mooney 205SE
1980 Mooney 231
Aided and abetted building a number of other RV's.