I have an 18” Rikon bandsaw and the table is slightly dished in the front (about 2-3mm) even with the alignment screw fully tightened. I would like to try to flatten the table. I’m not sure if the table is steel or cast iron, but either way, what would be the best method to flatten it? Angle grinder? Belt sander? Other? Should I even be concerned about this amount of dish?