I remembered something; if you like jumping feet there are options, but you have to find one that works with a 66. It's a general low shank, but the angle between presser bar and the neelde clamp controlling the movment can differ. I have broken two jumping feet when I borrowed from my other machines, they were general low shank, and should have worked with my 99 and 201 but didn't. I guess it's much the same with any machine new or old, nothing is completely identical even if they are made to more universal stanards.