How to Use a Ball Top Cap Adaptor on Your Truck

Quick answer

Attach the Quad Lock Ball Top Cap Adaptor to your truck's existing 1" or 20 mm socket arm without tools, then snap on your Quad Lock case or MAG head for a secure phone mount.

Step-by-step installation

1. Remove the existing ball or cap from your socket arm: Unscrew or release the current ball top or cap from your truck's socket arm. Most arms have a set screw or a twist-lock collar. Keep the arm's base attached to the vehicle. Common mistake: trying to install the adaptor without removing the old cap first—the ball won't seat properly.
2. Attach the Quad Lock Ball Top Cap Adaptor: Place the adaptor's threaded base onto the socket arm and hand-tighten it. No tools are needed. Make sure the ball is oriented so your phone will face you when mounted. Check that the adaptor is fully seated before tightening—a loose connection can wobble while driving.
3. Mount your Quad Lock case or MAG head: Twist your Quad Lock phone case or MAG head onto the ball top until it locks with a click. To remove, twist in the opposite direction. For magnetic attachment, ensure the MAG head is fully seated before releasing. If you use a MAG head, clean the ball surface first—dirt can reduce magnetic grip.

What you need

• Truck - Ball Top Cap Adaptors: The Ball Top Cap Adaptor fits 1" or 20 mm socket arms and installs with no tools. It uses a familiar ball design for quick setup with your existing mount. You can upgrade to Quad Lock mounting without buying a whole new arm—just swap the top cap and you're ready to twist and lock your phone.