I tinkered with the Facet Twist jig I wrote about last weekend. This iteration covers the length of a pen.
The last jig was designed to twist 120 degrees over a 3/4" span.
All I did was stretch the plug so that it turns 120 degrees over about 2.25".
I may cook up a few more variants and will post the 3D models in case they're interesting.
This is fun.
Thanks for looking.