How to handle filets when changing a model later

 From:  Frenchy Pilou (PILOU) 13 Mar 2018  (2 of 7) 
8862.2 
Make a box a little little more biggest overlaped the existing fillet
Bolean Union with existing
Remake Fillet ;)

More easy than this! But not a very big deal...(read Right to Left)
here the Script! http://moi3d.com/forum/index.php?webtag=MOI&msg=5931.1

EDITED: 13 Mar 2018 by PILOU