A White treadle will hold a White machine. A Singer treadle will hold a Singer or maybe a Japanese machine. But there are different size bases. You have to measure the hinge distance area of the machine and the treadle. Then the machine has to be the right length and width for the opening. Kenmore machines have a different hinge arrangement than Singer. Yes you can make a new top for the treadle base. Glenn has talked about cutting holes and fitting pieces together to hold various machines. We have tried carving up an old table top to fit in a treadle. It sort of works but doesn't look very nice. I think there maybe some old threads here or maybe on treadlon about the treadles if you have time to search. I wish there was an easy answer.