Is it loose where the auger bit attaches to the motor, mine was slightly loose on my model 30, but not enough to be a problem, a thin piece of copper(you can get it in a sheet) wrapped around the shaft may work you can get it in various thicknesses its called shim stock, get a feeler gauge the one that has the wire type and tip the auger to one side and see bow many thousands you got then divide that by 2 and that will get you close to the thickness you will need to take up the play, good luck