yeah the new ones have locking system you raise it up flip a lever with your toe and the open the hydraulic dead man valve. Bottom of platform had pin that resets the lever so next raise it automatically locks. Some of our old medium truck lifts had no safety locks we use tall jack stands, under the saddles. they were installed in 1964 and worked great. Someone couldn't see past the non locks even those there had never been fault. Those great working in ground 2 post were all torn out and replaced with Chinese garbage, By Peterson hydraulic, contract winner, who hired some fly by night dude with a back hoe and bucket of pipe fittings to remove and install the new ones. 8 of them. 1st issue the rear ground boxes for the saddle to drop down into were to wide. If the cover doors are close as raise the lift it is designed to open them the old one worked perfectly, new ones would hit the diff and not clear the saddle. Had to be opened before moving a truck on the lift and then closed after moving the truck. Hmm big gaping whole in the ground for someone fall in while moving the truck. Next issue they all leaked more oil then the 40 something year olds they replaced Peterson Hydraulics sent out 2 "techs" to repair the leaks, and failing control valves. Idiots left the electric pump running cavitating, low on oil for an hour. I chewed them out for it, pump was damaged they left, never came back bunch of tools and crap left laying around, took Peterson 6 month to replace that pump. never did fix 3 of 6 leaking piping to the cylinders. Low F'ing bid gotta love it