There was a recent thread about this very thing but with another machine. A few of the suggestions were the kneeling garden pads made of rubber or foam, putting the machine on a very sturdy table and/or adding one of the quilted machine tool/machine caddy with a lot of batting in it. I would put the machine on a very sturdy table (think wood), up against an exterior wall. There is usually more framing there. Years ago, I was doing some machine embroidery and was using one of the 6 foot fold up tables. The machine wasn't stable at all. I put a 2' x 3' piece of thick plywood under my machine and it stopped most of the shaking.