"No Hex Key?:" & P8 ]2 F( D1 d1 M4 t8 \; k s ) t( E9 v, y$ k4 U1/2 3/8 1/4 inch rod couplings can be used in a pinch if you need a hex key or allen wrench. insert rod coupling into hex opening in lug set screw and turn with wrench. : a* ?% ^9 F! u v* u+ c' e% |1 V