"You could do the cable and sleeve method with a winch. I just can't find the words to describe it right now. Sort of like a retractable antenna." Anything that could leak, I'm ruling out. The cable/sleeve/winch idea is interesting. I have an idea how that could work. Basically a top internally moun...

I guess I should also add that I'm only looking at a retracted length of 15"
and extending to 32".

Also, max weight is 100lbs.

Thanks Snow & Dork for your replies! Here's the basic idea: http://i43.tinypic.com/2nlbi2q.jpg I'm looking at reduction/servo drive to power the screw: http://www.nookindustries.com/jack/JackHome.cfm I haven't been able to find the screw off-the-shelf, but I have seen them while cycling through the ...

I'm putting together an art piece that requires an electrical lift that can extend more than double it's retracted length. I'm having difficulty locating a telescopic jackscrew that would do the job. Google has not been my friend. Hoping some astute burner gearhead in the aviation industry knows whe...