I have one of these, love it because it is solid. Not sure what specific type of machine goes in it, husband made me different adaptor boards to set down in it and I have used it for my 301A. A couple Kenmore. Don't recall if used the featherweights in it or not. Use the different adaptor boards husband made it when switching machines. Couple are U shaped to fit around machine, some to raise machine up off the metal tray underneath. Never knew this had a name, thought it was some home made table. Learn something new everyday off this board. Thanks.