We are looking for a vendor to supply off the shelf Screw Jack Screws & matching Nuts. Somewhat similar to this product but longer. We can ask for quotes from custom machine shops but were hopeful we could keep cost down by buying a product already being manufactured in volume... and hopefully directly from the manufacture to escape the double mark-up. We are looking for a lift range of 24 to 36 inches and the ability to lift a few hundred pounds and hold it in a dynamic environment... Thanks for any help.