Patrice,
Okay, I question "inside" the line. I sew just a tad to the outside of the line, towards the outside corner, so when I fold the inside triangle over I'm folding on the line. Is this just a matter of semantics? Are we saying the same thing? Or not?
Anyway, Debbie, when you go to sew your flying goose onto the middle square, be sure to put the goose on top. That way you can direct your seam right on the edge of the point and when you flip it, it'll be perfect.
I made the same mistake you made, many,many times, until the light finally dawned, "oh, I need a seam allowance!" Like, DUH! I can be taught. :roll: