If you've received replacement triggers or springs from Foil Drive Support, follow this guide to install them correctly.

This procedure can be used to replace either the throttle trigger, the cruise control trigger, or both.

Important: The trigger pivot posts are moulded into the controller housing. Applying excessive force can break these posts, requiring the controller housing to be replaced. Work carefully and do not force any components.

Before You Begin

You will need:

• Replacement trigger(s)
• Replacement spring(s)
• Small Phillips head screwdriver
• Needle-nose pliers (optional)
• Small Phillips screwdriver or drill bit (optional, to help align the spring)

Before starting:

1. Turn the controller off.
2. Remove the five Phillips head screws from the rear cover.
3. Carefully lift off the rear cover.

The rear cover can be removed safely without any components springing out.

Step 1 – Remove the Existing Triggers

The triggers are spring-loaded, so remove them carefully.

1. Gently lift one side of the trigger.
2. Slowly lift the trigger off the pivot post.
3. Remove the spring.
4. Repeat for the second trigger if required.

Important: Do not lever or twist the trigger off the pivot post. Lift it carefully to avoid damaging the post.

Step 2 – Identify the Correct Trigger and Spring

The two triggers are different sizes:

• Throttle Trigger – Larger trigger
• Cruise Control Trigger – Smaller trigger

The springs are also different.

Long-Arm Spring

Used with the Cruise Control Trigger (small trigger).

Short-Arm Spring

Used with the Throttle Trigger (large trigger).

Although it may seem counterintuitive, the long-arm spring fits the smaller trigger, and the short-arm spring fits the larger trigger.

Step 3 – Understand Spring Orientation

Each spring has two ends:

• U-shaped section – Pushes against the trigger.
• Locating arm – Fits into a moulded groove inside the controller housing.

The locating arm must engage correctly with the plastic locating groove to provide proper spring tension.

Step 4 – Install the Trigger and Spring

There are two common installation methods.

Method 1 – By Hand

1. Insert the spring into the trigger.
2. Hold the spring so the locating arm faces into the controller housing.
3. Slightly compress the spring until the holes in the trigger and spring align.
4. Carefully position the trigger over the pivot post.
5. Lower the trigger onto the pivot post until it passes through:
   • The bottom of the trigger
   • The spring
   • The top of the trigger
6. Ensure the locating arm of the spring engages in the moulded groove inside the controller.

Method 2 – Using a Guide Tool (Recommended)

A small drill bit or Phillips head screwdriver can make installation easier.

1. Insert the spring into the trigger.
2. Pass the small drill bit or screwdriver through the trigger and spring to keep them aligned.
3. Position the trigger over the pivot post.
4. Carefully lower the trigger onto the pivot post.
5. Once the spring is seated correctly, remove the guide tool.
6. Press the trigger fully onto the pivot post.
7. Confirm the spring locating arm is seated in the moulded groove.

This method helps keep the spring aligned while installing the trigger.

Step 5 – Test Trigger Movement

After each trigger is installed:

• Pull and release the trigger several times.
• Confirm it moves freely.
• Confirm it returns smoothly under spring tension.

If the trigger does not spring back:

1. Lift the trigger carefully.
2. Reposition the spring locating arm into the moulded groove.
3. Reinstall the trigger and test again.

Step 6 – Inspect Before Reassembly

Before replacing the rear cover, check that:

• Both triggers return smoothly.
• Springs are seated correctly.
• No wires are trapped or pinched.
• Internal components remain correctly positioned.

Step 7 – Reassemble the Controller

1. Refit the rear cover.
2. Reinstall the five Phillips head screws.
3. Tighten the screws evenly until secure.

Do not overtighten the screws.

Step 8 – Check Trigger Calibration

After replacing the triggers or springs, check the trigger calibration.

With the controller powered on:

• Confirm the throttle reads 0% when the trigger is released.
• Pull each trigger and confirm it operates smoothly through its full range.

If the controller displays anything other than 0% when the trigger is released, recalibration is required.

Refer to the How to Re-Calibrate Your V3 Controller guide for step-by-step instructions.

Still Having Issues?

If you've completed all of the troubleshooting steps above and your issues persist, the next step is to submit a warranty claim for assessment.

Please complete the warranty form for your region and ensure you include:

• Your Foil Drive serial number
• A detailed description of the issue
• Clear photos and/or videos demonstrating the fault
• Proof of purchase receipt 

Providing complete information when submitting your claim helps our Support team diagnose the issue faster and reduces delays in processing your warranty.

Warranty Claim Forms

• Global: https://foildrive.com/pages/warranty
• Europe: https://eu.foildrive.com/pages/warranty
• Americas: https://us.foildrive.com/pages/warranty