I just bought a pair of Hein Werner Air Bumper Jacks 4 ton capacity each. Got a good deal on them. Anyone ever use these antiques? Oldy but goody or Antique junk of yesterday? Likes-Dislikes? I'm picturing some steel, my welder, and a ghetto midrise lift is in the works.... maybe.... or at least I can use them to change lawnmower blades lol. Your thoughts gents?