Been meaning to make this for years & finally got the chance last week. Had my machinist (tool & die maker) neighbour turn me up the shaft that fits into the floor jack, but you could make it bolt onto the pad if your jack does not come apart like mine.
![Image](http://i728.photobucket.com/albums/ww284/Downresto/DSCN1872_zpsc6otqf8f.jpg~original)
![Image](http://i728.photobucket.com/albums/ww284/Downresto/DSCN1870_zps6xrgd2pt.jpg~original)
![Image](http://i728.photobucket.com/albums/ww284/Downresto/DSCN1875_zpsywyrqqli.jpg~original)
![Image](http://i728.photobucket.com/albums/ww284/Downresto/DSCN1873_zpsvzkx5qze.jpg~original)
![Image](http://i728.photobucket.com/albums/ww284/Downresto/DSCN1874_zpsu1pfnvup.jpg~original)
Material, 100mm X 8mm flat bar. 1 of 600mm, 3 of 150mm (2 have 50mm radius cut in one end) & 1 of 100mm (with a 40mm radius cut in one end.
If you are bolting to the jack pad plate, you will need some spacer material between the bottom of the pad plate & the flat bar.