Okay, I understand what you're saying. The load was a phone. I wonder though if it was a result of the edges curling up like Frodo said and something caught it repeatedly which caused the weak spot. Also, I've found that starting on the inside of the adds more play into the stitch which has been disconsterting to me.
I agree, that my flap was too short.
The edges were burnished although the edge bevel was irregular. Could you explain what you mean when you say "insist more on the interior faces"?
In regard to the beveler, I did bevel my initial carving. Inside the flower, most of the lines (the three on each pedal) are decorative cuts and unbeveled. All other lines are beveled. Should decorative cuts be beveled?
Thank you all for the input!