I have this, http://cgi.ebay.com/2-x-MG995-Hi-Speed-Torque-Metal-Gear-RC-Servo-Horns_W0QQitemZ250363971052QQcmdZViewItemQQptZRadio_Control_Parts_Accessories?hash=item250363971052&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A1%7C39%3A1%7C240%3A1318 on all my 5 turcks.... Awesome power & speed...
do you mean this?
http://cgi.ebay.com/Hpi-Savage-Hub-Hex-Conversion-Set-17mm-87229_W0QQitemZ280267942819QQcmdZViewItem?hash=item280267942819&_trkparms=39%3A1%7C66%3A2%7C65%3A1%7C240%3A1318&_trksid=p3286.c0.m14
I had this on mine, much easyer for changing wheels.