Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
P
So you must use Plugins of Fredo Joint PushPull, Curviloft Shape bender by Chris Fullmer...
Youtube Video
or this one (there a free version! 😉 Minute 3.50
Or use intensively the SketchUp native tool: Sand Box
