4 z: V7 j: x" @* K, ?( }% X1/2 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. $ D o( y& D% ~/ W6 s7 L2 ~+ [- `* S% t, ^+ E- V5 J2 J: G2 ?6 S