Howdy
No I bought it off Aeroquest Machining
http://www.aeroquest-machining.com/page9.html
It has 2 large prisims, one movable to allow good radial adjustment to locate guidestars easily. Loosening the 4 brass knobs allows the whole thing to rotate, its a very clever yet simple design.
http://www.users.on.net/~josiah/focuser/IMG_9935.jpg
This is a pic of the inside shortly after installing it on my scope. It required cutting an 8 inch hole in the tube. As the base is so large, it is ablolutely rock solid, you could almost swing off it and not see it flex
The focus for guidestars is a little too far in, but I use a 2.8x barlow anyway, for plenty of magnification, and the eyepiece is usually easy to get to for guiding.
Scott