E-flite AT-6 Texan 25 ARF - Manual (Page 9)

9 E-flite AT-6 Texan ARF Assembly Manual
 4. Slide the stabilizer and tube in position in the fuselage.
Note the direction of the control horn and that it faces
the bottom of the fuselage. Slide the remaining stabilizer
onto the tube. With both stabilizer halves tight against the
fuselage, use a drill and 5/64-inch (2mm) drill bit to drill
through the hole in the stabilizer and into the stabilizer
tube.
 5. Secure the remaining stabilizer onto the tube using
a 3mm x 10mm self-tapping screw and #1 Phillips
screwdriver.