Finding center curve of a tube like solid

 From:  Frenchy Pilou (PILOU) 4 Jan 2021  (15 of 36) 
10098.15 In reply to 10098.13 
Take a look here : https://moi3d.com/forum/index.php?webtag=MOI&msg=8847.20
it was a variation of the Chipp Walters trick ! ;)

Maybe you will obtain the result you want without use a middle curve! :)
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Pilou
Is beautiful that please without concept!
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