collar 183 the upper surface 165 of the main body 163 and the cylindrical arm 176 in this alternate embodiment the rib or brace structure 203 is cast as one member with the main body 163 collar 183 and cylindrical arm 176 however in additional embodiments the brace structure 203 may be welded to the main body 163 collar 183 and cylindrical arm 176 or may be connected by other means in this embodiment a rib or brace structure 205 extends between the upper surface 165 of the main body 163 and the cylindrical arm 176 in this alternate embodiment the rib or brace structure 205 is cast as one member with the main body 163 and with the cylindrical arm 176 however in additional embodiments the brace structure 205 may be welded to the main body 163 and to the cylindrical arm 176 or may be connected by other means in operation the alternate embodiment packing nut lock and tool 161 is installed on the reciprocating pump 12 and engaged disengaged with the packing nut 38 just as for the first embodiment of a packing nut lock 67 and also for the additional embodiment of a packing nut lock 121 however in the packing nut lock and tool 161 of this embodiment the cylindrical arm 176 and the substantially rectangular engagement member 177 extend radially outward from the center.