http://www.cjautos.org.uk/phdi/p1.nsf/supppages/cjautos?opendocument&part=2
I borrowed one of these years ago and they certainly are good. Problem is they cost about as much as a commer van.
Using memory, the internet, some cheap cider and broken biro I came up with a plan to make my own. The complicated bit (for me) is the threaded bit - so I decided to miss that and use a Landrover jack instead.
I scaled everything up a bit so that it will be able to flip a commer.
Still very much work in progress (or not as I haven't actually done any for 3 weeks) The idea is begining to take shape. Most of the steel is offcuts from the local metal yard. I was really lucky to find two discs already cut in 12mm plate. They still took 2 1/2 hours each to drill out...
I'm working on them at a mate's workshop. hopefully get a chance to do some more work in a few weeks time.
Then i'll be able to underseal my various rusty cars with ease!