My kit and shop made stroke sander was a back breaker to raise and lower the table. There were two hand cranks underneath the table. I used one of those killer Craftsman garage door openers to make a motorized lift. These garage door openers were taken off the market. They would hit a small object like the neighbor's cat and if enough force was reached to move an internal spring the door would reverse so as to hang the poor critter!
Works great with a DPDT Momentary toggle switch and lots of internal re-wiring.
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