Doug - Go ahead and build your own and modify the design however you see fit. It's easy and fun to make...
The wire dubbing block was not my idea. It is based on designs that I read about in an article by James Smith, as well as Jan Siman's Turbo Spinner Block design (
http://shop.siman.cz/art_turbo_spinning ... ctions.pdf). The Summer 2007 edition of Fly Tyer Magazine had an article giving detailed step-by-step instructions for making your own Turbo Dubbing Twister tool. After reading the article, I spent an enjoyable day making my own dubbing twister.
I stole the bearings out of the wheels on an old pair of my kids in-line roller blades. I built mine with two bearings instead of the single one listed in the article. I put one set of bearings on each end of the Xacto blade holder to make it more stable. I found the other parts (pipe strap, handle and screws) at a local Ace Hardware store. I think I spent around $15 for the components. I could have cut this down to less than $10, but I used the more expensive thread tensioners.
I decided to paint the wood a solid white color to make it easier to see how much dubbing was added to the center slot. I changed the clips by substituting thread tensioners I bought from Cabelas. I used a Sharpie Marker to add markings along the edge of the dubbing slot to make it easy to make consistent dubbing brushes (repeatable lengths of different colors of dubbing).
The white block looked a little plain (stark) so I jazzed it up by adding some Jungle Cock Nails to decorate the top of it. Overall, I am happy with the way it came out.