Kevin,

I did some more measuring and I discovered that stab tube sticks out 4 1/4" (from fuselage side to end of tube). If you tap at 4" this puts you out near the end of the tube and makes it easier to put in the T-nut that they supply. It also matches the picture that they have in the back of the manual. Tapping at 3" is doable, but it makes it a little harder to put the T-nut in.

Terry

..... Flying! you are harcore .... it was raining pretty heavy where I live...