Aileron and flap servo mounting:
Set servo on 1/32" ply before gluing gussets and placing servo screws. Then servo will be mounted perfectly when ply is removed
Servo mounting frame glued into wing under sheeting. The removable servo fixture screws to this frame
Both servo mounting fixture and aileron horn flush with sheeting
Du-Bro #366 control horns for flaps
Make sure control horn for the flap and the servo horn are perfectly aligned so there is no load on flap servo in the UP position