Originally Posted by
imrob
so far for an aluminum servo hor the only one that i could find that use 4/40 is the losi. i have no idea if this will work yet or not but i might buy one and try it out and see. all the rest have a 3mill thread so unless there a conversion i dont know about to get the ball to work.. the losi might be best.
Why not drill the horn for the ball stud, and use a nut? Of course, you'd have to make sure it'd clear the top plate. And that the ball stud/cup clears the servo too.