<netnanny bullshit deleted>
I've used bottle jacks to do some pretty amazing things. Even the little
two ton ones. Yes, steel plate is good to use. You can probably get some
scraps at the local steel supplier or recycler, or just scrounge. I make
jacks out of pipe and the masonry screw corner things, then put a jack on
top of that, screw it up, and start pumping. Handy things, and not
expensive. Pretty sturdy and stiff. I found the screw corners at yard
sales for a buck apiece. Bet they cost a lot more than that new.
BIG CAUTION .... be sure the base you are putting the jack on is substantial
and will take the weight. Also make sure that it won't kick out sideways.
Always put pieces in between jack rather than using the screw out foot, as
lengthening the foot makes it more unstable.
Jack short distances, then brace, reset, and jack short distance. If the
worst happens, it's supported, and will only fall a short distance.
Go slow. Be safe.