www.phcppros.com/articles/7972-keeney-manufacturing-plumbers-third-hand

Keeney Manufacturing Plumbers Third Hand
August 9, 2018
The product holds the strainer flange in place and the disposal off the ground, leaving both hands of the installer free to finish the installation. Featuring a threaded shaft with a spin down locking wing nut that secures against the strainer opening, the product uses the weight of the disposal to hold down the flange and hold the disposal in place while installing the mounting hardware.
The tool is designed to work with all standard garbage disposal configurations.
Keeney Manufacturing Company