I just used plumbers tape (it's metal) to hold the stand of the machine. Like I said, not exactly fine woodworking. If I find that it is too jiggly, I can attach the piece of plywood that holds the machine in place with actual wood and L brackets.
Second iteration was with the plastic you can buy on a roll at fabric stores to put over tablecloths--better--a bit more slippery but not flat enough.