Changing Rubber Feet on MMF-5 to Cones??

I was able to find Dayton ISO -4G Isolation Cones at Parts Express, but they stick on. I would require something that screws into the bottom of the unit, correct? It was my understanding that the rubber feet are attached with screws. Where would I be able to locate the correct cones for the table? I am trying to make it a little easier to level as well as reduce vibration. I've heard of others changing the feet, but haven't been able to nail down what product they used. I'm still figuring all this stuff out here, so any help is appreciated. Thanks guys!