tab 80 the first end 86 extends through the first aperture 68 and the second end 88 extends through the second aperture 70 the first and second ends 86 88 are threaded in opposite directions in the illustrated embodiment the first end 86 includes right hand threading 90 and the second end 88 includes left hand threading 92 however one having ordinary skill in the art will appreciate that in other embodiments the first end 86 can include left hand threading and the second end 88 can include right hand threading the shaft 84 includes a first operator 94 which is located between the first and second ends 86 88 the first operator 94 includes one or more flat surfaces 96 so that a wrench not shown or another similar tool can easily grasp and turn the shaft 84 about the longitudinal axis 76 in the illustrated embodiment the first operator 94 is integrally formed with the shaft 84 and includes six flat surfaces 96 in this manner a conventional open end wrench can be used to turn the first operator 94 however one having ordinary skill in the art will appreciate that in other embodiments the first operator 94 can include any number of flat surfaces 96 and can be engaged by any number of tools including spanner wrenches and the like similarly in other embodiments recesses or protrusions can be machined into or extend from the first operator 94 respectively to facilitate engagement with other tools the shaft 84 also includes a second operator 98 which is substantially similar to and adjacent the first operator 94 the second operator 98 also includes flat surfaces 96 and can be rotated with a tool about the longitudinal axis 76 in the illustrated embodiment the first and second.