Not the same. The Parker system doesn’t lock it just puts something behind to prevent up pull . This in practice is useless because it still doesn’t help with double stop bends and is never quite hard against the back stop . It only works if you set it in down bend only and tighten the spring enough to resist a bend ( not going flat) . Then you can’t switch to floating without rebalancing. I had two and it doesn’t work in practice to switch. It’s fine as one or the other. The other systems that can do it are; TT , Auto latch ,convertible . The last two are constantly in need of adjustment..