Setting up a single-servo aileron system can be tricky—especially on classic or vintage RC models that rely on bellcranks instead of dual servos. Many builders try to pair two pushrods into one E/Z connector, but this creates metal fatigue, slop, and eventual mechanical failure. Fortunately, DU-BRO provides the correct solution: the Ball Link Aileron Connector (SKU 183).
This durable, adjustable connector is designed specifically for installations where two pushrods need to meet at a single servo arm. It provides a secure, ball-bearing-style pivot with virtually no slop, and it eliminates the dangerous practice of drilling out E/Z connectors.
To support your installation, DU-BRO also offers bellcranks, linkage hardware, threaded rods, and solder-on couplers.
Why You Should Never Drill Out E/Z Connectors
Some builders attempt to enlarge E/Z connectors to accept two pushrods. This weakens the brass, rounds out the hole, and causes:
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Progressive slop
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Thread deformation
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Pushrod movement under load
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Total linkage failure inside the fuselage
If that happens, repairing the damage often requires cutting into your model—a major headache and a risk to your finish.
DU-BRO explicitly warns against modifying E/Z connectors, and the Ball Link Aileron Connector exists as the proper—and far safer—solution.
For precision E/Z connectors that are designed for single-rod use.
How the DU-BRO Aileron Connector System Works
For a single-servo, dual-bellcrank setup, the Ball Link Aileron Connector is designed to be used with:
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DU-BRO Bellcranks (SKUs 167 and 851)
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Two soldered pushrods
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A single servo arm mounted ball link
This system is ideal when you cannot use one long rod between both bellcranks—common in older kits or large-scale models.
Each connector kit includes:
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A nylon block
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A steel ball link
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A locking nut
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Two threaded brass rod cups
These parts create an adjustable, slop-free connection between both aileron pushrods and the servo.
For bellcranks
Step-By-Step: Installing the Aileron Connector
1. Build the Pushrods
Because the brass threaded ends must be soldered to the rods, this step is best completed during the model’s initial assembly. DU-BRO provides full guidance on soldering rods and couplers:
https://www.dubro.com/blogs/du-bro-101/du-bro-101-threaded-rods-and-couplers
2. Assemble the Ball Link
Attach the ball link and nut to the servo arm. The nylon connector snaps onto the ball with little to no slop.
3. Screw the Threaded Rods Into the Nylon Block
Insert each pushrod into its brass coupler and thread both couplers into the nylon block. This allows you to fine-tune length and symmetry.
4. Adjust for Equal Aileron Travel
Cycle the servo using a tester or your radio. Adjust both rods equally until both bellcranks move the same amount. Unequal travel results in inconsistent roll performance.
5. Ensure Zero Binding
Move the system through full deflection. Binding indicates misalignment or incorrect rod length. Correct before flying.
A Strong, Adjustable, Slop-Free Aileron Solution
The DU-BRO Ball Link Aileron Connector is the safest, cleanest, and most professional way to set up a single-servo aileron system. Unlike makeshift solutions, it offers long-term reliability, smooth movement, and precise adjustability—perfect for classic builds, scale aircraft, and any model using bellcrank geometry.
