if no luck you can always go to your nearest automitive store/hardware store and try whats called a "heli-coil",Its basicly thread inserts
http://www.rcuniverse.com/forum/m_25...tm.htm#2584192
http://www.rcuniverse.com/forum/m_23...tm.htm#2349508
http://www.rcgroups.com/forums/showthread.php?t=554327
read thu theads links they may help