Quote:
Originally Posted by Dean Pearson
Very possible it is a tool balancer but it could also be a fall protection device (yoyo) that would attach to a full body harness or safety belt in the old days.
If the cable spools out easily I would lean that direction, if it is hard to pull out or is adjustable as far as how hard to pull out it is it could be a tool balancer.
Dean. 
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Go to aero motive Web site it has picture ,decription and intended use ,listed as a weight balancer,but it has ben discontinued does not meet Material Saftey Data ( OSHA )