try to use master airscrew 11x5 , 11x6, 10x6 props, they are cheap enough when you learn and doing the trick.
try also dubro spinners as they come with metal nuts - very practical.
http://www3.towerhobbies.com/cgi-bin...&I=LXZ970&P=ML
http://www3.towerhobbies.com/cgi-bin...&I=LXE129&P=ML
or similar to these.
Alex