Picked up a great floor jack at an auction -- paid like $12.50 for it It's one of the older big ones. Anyway, now it's quit working after I haven't used it in a while. There's two plugs -- one in the base and one on the "barrel" of the jack. Do you add oil to the base, then bleed air out the barrel? Everything moves, just won't lift. Might be airlock, but I can't seem to clear it. Don't want to try tearing it down if I don't have to!