Can anyone identify this floor jack that's for sale local to me on craigslist? From what I can tell it appears to be a Walker? anyways the add says that it slowly lowers on its own, however I could probably source a rebuild kit somewhere. If it is a walker, is there a piece missing that covers the hydraulic cylinder? Some pictures I've seen have them and some don't. I called the guy, got voicemail. I will potentially be buying this, this weekend. Thanks