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Re: Scissor lift?
It's generally very difficult to make scissor lifts "work", and when they do work they have many poor mechanical/kinematic qualities. They need to be light-weight to work decently, but it takes a lot of added weight to make them robust enough to actually work. It also takes a tremendous amount of force to start lifting them, as there is a very poor transmission angle.
Regular arms, four-bar arms, and forklift/telescoping elevators are all mechanically preferable to scissor lifts.
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