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Creating an automated metal tube slide


I want to take an aluminum round tube 1-3/4" x .065 wall and have it slide onto a steel tube. Kind of like the forks/shocks of a motorcycle. the aluminum tube is polished on the inside and the steel tube  will be polished on the outside. The structure will be horizontal with the load on the end of the aluminum tube. About 35 lb. I'd like help figuring out how to fasten bushings to these tubes and what bushings I should use. Also how much space there should be between the steel tube in the aluminum for the bushings. 

I'm also looking for a device like an actuator to extend and retract this slide about 1.5 ft. Via electricity from your normal electric outlet, and a 3-way switch. And would like any recommendations on what I could use. Preferably something low profile and if at all possible put inside of the tube to hide it.

I want to add that I also want the actuator or device to move slowly at about 1 inch per second.

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