You may be better off with a lower profile focuser and have extension tubes to cover the rest of the distance. Bintel sell a 35mm extension tube and a 50mm extension tube.
http://southcelestialpole.org/scpBB/download.php?id=764 here is the 35mm one giving me a racked in distance of 83mm, with the 50mm extension it will give me almost 100mm, which is the same as the Focuser that was on there. The NGF focusers are worth every cent, or as an alternative go with the Moonlite range, also very nice.