Should be Tip # 5 I think
A few more pictures of attaching the small triangles.
Once both triangles have been attached the long bias edges need to be squared. Using a long ruler, mine was 4" x 14" (one of my favorite rulers to use), lay the 45 degree angle against the diagional edge and the straight edge of the ruler on the 1/4 inch mark on the tip of the dark triangle. (clear as mud so far)?
Not a very good picture, hope it helps though.
attaching triangles
[ATTACH=CONFIG]23729[/ATTACH]
45 degree and quarter inch
[ATTACH=CONFIG]23730[/ATTACH]