Remove the extender leaf from beneath the table. If it is stored in a closet or basement, place it within reach of the mahogany dining table.
Pull the two halves of the table apart. Mahogany is a heavier wood, so your helper will come in handy. Pull carefully so that momentum from the table's release will not propel either you or your helper backward..
Insert the extender leaf into the gap between the table halves.
Insert the pegs of one side of the extender leaf into the peg holes of one table half.
Align the pegs of the other side of the table into the peg holes of the extender leaf.
Push the table halves together until you see no gaps between the leaf and the table.