1. Confirm you have all the parts that are shown below.
2. Remove the plastic insert from the cross bar.
3. Slide the spring onto the locking pin. Install the locking pin with spring through the large hole and then push the locking pin up into the small hole. Reinstall the plastic insert into the cross bar while holding the locking pin in place.
4. While still holding the locking pin through the small hole install the washer on the pin. Then install the knob on the locking pin and then slide the “C” clip into the top groove on the pin to secure the pin to the cross bar.