Tom

In the 28% planes manual, you suggest a way that does not allow anything to show on the top surface (ailerons+elevator).

1) My LHS carry only Dubro and Sullivan control horns. May i use Dubro #866 control horns without the black molded washer and replace the 8-32 Allan bolt by a new treaded screw that i am gonna cut to desired length (invisible from the top)?

2) Should i glue the treaded screw into the hardpoint to eliminate any risks of hardware failure from a 50CC engine vibrations?

Is that way as safe as the one with the screw head showing on the top surface?

3) Should i order Rocket city 69D hardware??
Daniel