You need no other support than these hinges when you want to have a table leaf pop up in the raised position. These are the hinges used in restaurants when you see a waiter flip up a leaf to turn a square table into a round one for extra space.
Leaf folds back 180 degrees under the table and hides away till needed. Use two hinges per leaf. 10 #8 flat head screws ( not included) are required per hinge.
Leveler Hinge quickly converts square table tops to round tops. Steel yellow zinc plated. Hinge is 7-1/2" x 5-1/4". As with all spring loaded hinge, keep fingers away from moving parts. Use caution when installing, spring loaded in two dimensions. Hinge weighs 13 ounces each.
Liberty Hardware