anyone else have a problem breaking this?

http://www2.gpmd.com/image/h/hrcm5303.jpg

Hitec hs-5645mg steering servo

i keep on stripping the teeth off the gold color piece. what am i doing wrong? this is my 3rd set that i'm installing. metal gears are getting expensive for me. :-(

what is the servo saver that's supposed to help with this? i've checked the wheels turning and the servo can fully extend. am i supposed to set it so that the servo should be able to extend farther than the wheels?

is there any place i can just buy the gold color piece separately?