Interesting , I was just going to ask if anyone uses Mitch's whirler and what they thought of it.

This seems to be a good page to see many of the whirlers available...

http://www.thefind.com/sports/info-dubbing-tools

Here's an easy way to make one.

Making the Easy Door Knob Dubbing Loop Tool - Volume 6, Week 39 Fly Angler's OnLine"

Chugger, just curious ...do you already own a Cal Bird?