This supplementary information applies to manuals with a copyright date of 20050712 (see back cover). Manuals having later copyright dates may already reflect this supplementary information.

Please see Page 6, Step 8.1 & Figure 8A. Step 8.1 and Figure 8A describe and show the dry test fitting of the vertical stabilizer into the vertical stabilizer slot in the top of the fuselage. On some early versions of the Bird Dog produced in July and August of 2005 the slot in the fuselage is slightly too deep so that the vertical stabilizer tab shown in Figure 8D does not contact the bottom of the slot when inserted into the fuselage. 

If your vertical stabilizer does not contact the bottom of the fuselage slot when inserted into the fuselage you need to rectify this with a small filler strip inserted into the fuselage slot and tacked into place with CA or other glue before installing the vertical stabilizer using 30 minute epoxy. The filler strip should be approximately 5-7mm high and the width and length of the slot. Use balsa or other light wood to make this strip. Dry fit the strip and the vertical stabilizer before gluing anything into place. The idea here is to make sure that the bottom of the vertical stabilizer tab seats firmly against the strip which in turn fills the gap in the bottom of the fuselage slot.