How to Support a Table Out of Plywood

Clear the table of anything on top of it. Cut down a selection of small plywood pieces with the saw. If you desire, measure out the size of the foot of the table leg to saw down the plywood shim to the appropriate size to prevent the shim from sticking out.

Place the level on the table top to determine where the off-balance area on the table is. Determine if one or more legs need shims.

Assign an assistant to push down on the opposite side of the table from the off-balance leg to lift the leg's foot off the ground.

Make micro-adjustments to the plywood to get the table level. Saw pieces laterally to decrease the plywood's width if necessary. If more than one leg needs a shim, make the needed cuts and micro-adjustments to it as well. Have the assistant hold the table up so you have access to the leg in question.

Slide the plywood shim under the leg's foot and have the assistant set the table down. Check the level to make sure the table is balanced and in plumb. Pull the shim out and glue a small rubber piece to both sides of the shim to keep it from sliding when placed under the table legs. Recheck the leveling as the added rubber may affect the level of the table.