My husband crafted the best set of risers for me. I am taking them to a Frieda Anderson dye class tomorrow. EACH leg has two PVC pipes that fit into each other. The one on the outside is bigger (obviously) and had a nice rounded bottom put on the end that goes to the floor.
The inside one is smaller and drops in the bigger one. It is not as tall as the outside one. Just cut on each end, no caps. The leg slides down in the bigger tube until it touches and rides on the top of the smaller one.
Add 3-4 in to best height (see below) to allow for variance in table height
Cost: less that $10.00 to make enough for 2 tables - 8 legs.
For height for YOUR table, put your arms, with bent elbows out and palms down. This 45 degree angle straight out from you while you stand upright is your best height.