I am trying to level a toolbox with a workbench that has casters with 4x4-1/2 caster plates and a 4-bolt pattern. I need to raise the front by 5/16 of an inch but I can't find any caster plates in that thickness. I don't have any tools that can cut 5/16 shim stock which is what all the hardware places have. Any suggestions? I thought about stacking washers on the 4 bolt holes but that would leave the caster plate unsupported.
