Here it is folks - the rare and elusive
Electric Penthouse Assist Jack
To operate.. plug jack into hand controller, plug hand controller into 12V on the wall, hold jack vertical between the penthouse lift handles and the floor and engage. This is a 12V screw jack. It will lift the penthouse up past the initial resistance until it stands on its own. Sorry - it will not help with pulling the penthouse back down.
This item was originally made by Sportsmobile and I think sold for over $1000. I got it a few years ago and paid something like $400. We have a new electric top now and don't need it.
I'm really not sure what it's worth now so make me an offer.