If you have found that your control horn twists after hooking up your pushrods, here's one idea that might help. Use one left and one right control horn, Goldbert or Du-Bro and Rocket City's Number 77 Heavy Duty Ball Link. Rocket City's number 77 link was designed to fill a need in quarter scale plans. The nylon is molded around the precision ground ball for life-time zero tolerance fit. They added 50-percent more material around the ball than their reular "Missing Link", and increased the body diameter and tapped it out for a 4-40 push rod. The hole in the ball will fit a number 2 screw.

When building your plane, build in the 3/32" plywood plate to mount the control horns. You should also build a 3/32" plywood doubler to help spread the load. Use 2-56 screws to attach the horns and epoxy the nuts to the top of the plywood doubler. By epoxying the nut you can remove the horns for covering.

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