You mean your not suposed to just epoxy them in the servo tray?[X(]

Check out the #3 screw like caerellh said but I have gotten to where I just pitch the screws that come with any servo and I use the socket head screws available here. http://www3.towerhobbies.com/cgi-bin...&I=LXFRM2&P=ML
Yes, it's more money but it's nice to be able to go to any of my planes with my allen wrench and remove and/or replace any servo.