i posted this on another site also .
this is a little addiction i made on the blade lock tool , simple just read the on , off , and you wont cross thread a prop again .
A prop ON CCW A prop off CW , B prop ON CW off CCW .
Thanks! The one thing I really dislike about my quadcopter is seems to be really easy to cross threads during installation. Even spinning in the correct direction causes me stress. Forget about tightening, just getting the props started and slightly "tilted" causes them to lock after just a half turn! If I feel any resistance I back off and start again. Annoying but, until there is a one twist to lock upgrade I have to live with this.