Blend and flip command

 From:  Frenchy Pilou (PILOU)
10023.8 In reply to 10023.7 
Yep but seems that is not exactly the same than the ancient crossing one! :)
(it's an old image! August 2006) my comment was made before to know the secret! :)
So the"near the middle" was not sufficient! :)

EDITED: 6 Nov 2020 by PILOU