This compact barrel clamp threads onto your 1/16" cable and gets held in place by a setscrew. The clamping screw has both a Phillips cross and a 6mm hex* for easy tightening. Barrel measures 8mm diameter x 9mm long (12mm long including 5mm diameter snout at one end). The barrel axis is parallel to the cable axis when installed. Many European karts run the throttle cable through a hole in the pedal and use a clamp like this to keep the cable from pulling back through the hole.
* Note: Please do not be tempted to use a 1/4" wrench on the setscrew or you will round off the hex.