Does anyone have a method of straightening out a cupped removable shelf on an antique china cabinet? I've read a bunch of stuff online and I'm not sure which is the best to use. I've included some pics of the cabinet and the shelf. Sorry for the 90 degree turns on the photos. They were upright when I uploaded.

Hi everyone, I have a bed with a drawer underneath that opens up. Originally there was only the swivel mechanism. And the top cover would not stay open, you had to hold it by hand. So I added furniture gas struts to hold it in open position. But it was still hard to open it. So I installed a linear actuator to open it. It came with power adapter and wireless remote control. Now its convenient to open it. But my problem is, this linear actuator only works with power, you cannot operate it by hand. So the only way to open the drawer is to use the remote, you cannot just open it by hand. That is ok, as long as everything is working fine. But if it doesn't there is no way to open it and get inside to fix it. For that I tied a rope on the pin that is securing the actuator to the bed, so if pulled it will release the actuator and i will be able to get inside. So now I am looking for similar mechanism but that is capable to be operated by hand as well. I was thinking maybe the mechanism from a car power trunk? But I have no idea how i could install it and wire it in. Maybe someone has any good ideas how to achieve both electric and manual operation of this drawer top? I have added some pictures that show how its all set up.