Joined surface instead of solid

 From:  OSTexo
6497.37 
Hello,

With some helix formula help from Michael I am trying to recreate the part using a variety of techniques using MoI only (I'm using Rhino/VSR for curvature, deviation and light lines analysis). There's more than one way to do this but my objective in the exercise is to have a controllable and flexible set of surfaces. The interior details should be an interesting challenge.

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