ORIGINAL: Stick Jammer
While some may prefer to incorporate a bell crank into the system, it's not needed for a single servo pull-pull. Go here and take a look for some info. The descriptions there referring to "bell crank" would be the servo arm.
http://www.swbmfg.com/rudex.html
Why is that. why would you want to put that big of a load on a single servo. i think its the only way to go if you have the room.