This is my design to add more vertical space to the tables used for markets and events. It's a multi-layered design with strict tolerances for the connecting parts. The uploaded files are available, though you might need to do some minor grinding on the pins to make them slide more smoothly. It's a three-part design with the height adjustable as needed. It's free for everyone to use. If you have any questions, please leave a message and I'll do my best to address them.