I recently purchased a 16 1/2" x 13 3/4" Durhand scissors lift table With a height range of 14" to 36", it will only reach the surface of my Bridgeport table when the knee is almost all the way down.
I wanted to avoid having to raise and lower the knee to remove or replace my vise and rotary table, particularly with a substantial weight on it. The answer was to make a booster block out of 2x6s and plywood as shown in the photos. Six coats of polyurethane on the top helps items slide easily. A small rectangular piece screwed to the bottom of the block registers in a matching hole in the table top to keep it from sliding around.
Table cost around $180 with free shipping at: https://www.aosom.com/item/durhand-3...s~C30-009.html