I must say, tension springs are amazing, thanks Ryan for the tip. Installed today these - McMaster-Carr - one for each motor. My table weights about 7.5 lbs (with the modified motor mounts and brackets). It is exactly what I wanted - table still dropping when off power but much slower - videos here: https://www.youtube.com/shorts/1SWS--e2MTE and https://youtube.com/shorts/zRqqBFRCHQc. How long they’ll hold the tension will time tell. Happy with the table, now onto hooking up and configure my new BT Octopus board.