Filled cavities help in clamping to tables

The ribs on the bottom of cast-iron tool tables help stiffen them, but also make it difficult to clamp on jigs, fences, and other accessories. I solved this problem by adhering filler blocks on the underside of the table using silicone caulk. The solution was so simple that I filled the cavities on the underside of my drill-press, bandsaw, and disc-sander tables.
—David Stradtman, Kewaskum, Wis.