You mean you want to install a premade electric screen or motorize a homemade screen? I have been toying with the idea of motorizing one as well. I have gotten down the to design yet, but you might want to look at an automobile power antenna motor as a starting point. They have quite a lot of gear reduction and run on low voltage so they are less daunting to a DIY'r. You might give an installer at your local car stereo shop a six pack of beer to hold onto the throw away's from when they get replaced. Usually the motors are fine, the antenna mast gets bent or broken.
I haven't done any thing to the screen it is just plain Blackout cloth. I have been thinking of trying some gesso. but not quite yet.
I used a piece of 1 1/2" steel electrical conduit for the rod with 1 3/8" bearings on the ends. The best thing that I found to attach it was double sided carpet tape. I have some photos on my website with the carpet tape being attached.
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