Bon, Bon, I have one of those clear extension tops that I broke on retreat. My husband who is a machinist made me another top out of plexiglass. He used the feet from the broken one. I use folding tables from Staples for my sewing tables. Again my husband cut down the legs so that the table would be the right heighth for me to sit perfectly perpenduclar. My main machine table is now just 27' tall. With the clear extension on the machine I can sit with my feet flat on the floor and my arms at the right height to give the maxium comfort.