I superglued a thin strip of metal to the bottom of the vertical piece so that it hits the base when locked in place so it cannot move when I put my tenor on the stand. A friend has an older version of the stand that does not have locks on the side pieces, like my flute, clarinet, picc stand. I've had to tighten them up so the stand doesn't fold up if I try to slide it on the floor.
Otherwise I really like Hercules stands, especially the flute, clar, and soprano pegs.