Choose a referenced flattening method for a twisted or crowned tabletop, and reserve sanding for controlled refinement once the geometry is true.
Identify disc-loop, pad-saver or backing-pad separation before buying replacement discs.
Compare short and long sander stroke with consistent abrasives, pads, extraction, and inspection of the complete finished result.
Choose a sanding block or sponge by the shape you need to preserve. Compare support, pressure, fit, and practical hand-sanding limits.
Compare 8-hole and no-hole sanding discs. Check pad diameter, attachment, extraction paths, and tool approval before choosing a 5-inch disc.