To square my disc sander’s table to the disc, I use an inexpensive welding magnet.

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To square my disc sander's table to the disc, I use an inexpensive welding magnet ($4, Harbor Freight, harborfreight.com, item #1939). The powerful magnet holds the table at 90° while I tighten the table-locking bolt.
—Michael Cyr, Westport, Mass.