I work in a small center as a pre-loader and have been yard certified 5 of the 6 years I've worked there. I am the alternate shifter when the main shifter is either on road or vacation. He has worked in the center longer than I have and was once given shifter pay. They have since stopped paying shifter pay right around the time I became yard certified. He filed a grievence and was compensated but they told him that was the last time he could do so. My first question is can I file a grievence on the same issue? My second question is more importantly are we supposed to get shifter pay at a small center?