The MARK Sawing Blank Table Insert (Polymer) is what you need for maximum support with minimum clearance.  Use it to make your own zero-clearance Inserts for more workpiece support, less bottom-side splintering, and no dangerous scrap fall-through.  For use during non through-cutting operations such as dadoing, molding, etc. where the upper saw guard will not be used.

Note: For all MARKs except MARK V 500