I am using the H9 accessory kit with the very robust Dubro linkages. The instructions say to drill the aileron control horn hole perpendicular to the centerline of the aileron. If I do this, the "A" nut will not sit flush on the surface. In the photos, the A nut magically sits flush with the surface. I could do this and not use the A nuts or drill perpendicular to the surface and use them. Also the hardwod block seems to be off, and if drilling hole as per instructions, I would be drilling through the edge of the block. I was considering using sullivan control horns. Any advise would be appreaciated.

I am assembling one now also. I just moved the location over a little to get the horn on the hardwood and I drilled perpendicular as the instructions say to do. When you tighten up the nut, it will compress the wood a little and sit flush on the surface. No big deal. I also suggest putting a little ca glue on the nut to keep it secured.

Jim

Just curious as to what servos you are using. I am using jr 8101's on ailerons 4131's on elevator and rudder. Thinking about using one 8611 pull pull on rudder. Dont know what motor I'm using yet.

I like digital servos. I'm using four Hitec 5945's on the ailerons, one JR 8611 on each elevator, and two JR 8611's on pull-pull on the rudder.
I'm using a BME 110 for an engine.

Jim

Actually, the hole should be drilled perpendicular to the top of the aileron. This puts the control horn pivot point closer to the hinge line. It is also the easiest why of drilling as all you need to do is place the aileron upside down flat on the drill press table and go to it. Perpendicular to the center line will also be OK but perpendicular to the bottom of the aileron is gonna cause a problem. It's simple to sand the "A" nut at the angle you need so it sits flat against the bottom of the aileron but after sanding you have to hold the "A" nut tight to the surface while screwing the bolt in from the top or it will chew up the aileron.