This is a pretty neat item. Great for doing fine focus and eliminating image shift at high mag on an SCT. It fits into your 2" diagonal, and accepts 1.25" eyepieces in its helical focuser. I shamelessly plagarized the attached photo from Gary Wolanski's website (note no eyepiece is included).
I used this all the time with my C8, but recently I've got an MN61 so I don't need the Wolanski focuser anymore.
In new condition. Originally $90 plus shipping, I'll sell for $75 including shipping in the CONUS.
Thanks for looking.