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Loft Winch for Fun

Hi, I want to make a fun lifting mechanism which I can use to raise critical beverages, light office supplies, etc., to the loft in our house, where my office is.  It could be manual or motor driven.  It can brace, lean against or grip the square handrail and square balusters,  but can't mar or be screwed into any woodwork or flooring.  Ideas?