Steve - Thanks - it's working out well.

Ron - I would not use this type of caster for a cart I was moving a lot because it does take longer to retract the feet than to pop the lock on a typical caster.  The CNC will stay in place for a while, but if/when I need to move it, I wanted to be able to move the cart easily.  I also liked that I could level the cart even if my floor is not perfectly level (and there are places in my basement where it's not exactly level).   For the flip-cart I'm building, I expect to have to move that more regularly, and I'll use standard locking casters for it.