I bought quite a few of the M12 threaded adjustable mounting feet from Warco over ten years ago, the type with the ball socket so the foot can seat flat on an uneven floor. They are adjustable for hight but are really designed to fit in a threaded hole, they are suplied with a single locknut but the lower hexagon is integral with the shank so adjustement isn't possible if they are used in a plane hole, unless they are fitted with a second nut as I had to for use in my Warco 1330 lathe.
The Warco 1330 requires six of them, they work perfectly well and are more than man enough for the job.


