If you ask me, ditch the screw shaft idea.I'm not sure if this would even fit the requirements for the final task. It is 24V (when we get 9V) and it only has a travel distance of 7" (about 17.78 cm) when we need 20 cm.Is it okay to put a hole through the square platform. I am trying to lift it with a motor that has a screw shaft, and in order for it to lift the platform I may need to put a hole into the middle of the platform. The device I am using can be found here.
https://www.surpluscenter.com/Electric- ... 5-1885.axd
Attaching the platform to a motorized winch is far simpler.