For sale is a CM MAX BALANCER MODEL:0943 RATED:500LBS. Pendant control WORKING RANGE:80" REACH:144" WEIGHT OF UNIT:98LBS. It does seem to work. I am not sure what it is supposed to do, but it has spring action and pulls objects when air is applied. Has some rust on the chain. INFO FROM WEBSITE: CM Max air balancer CM offers precise positioning or repetitive trans- ferring of loads as heavy as 600 pounds. With up to 8" of float, the operator can position the load easily and precisely by hand. It also features: Limitless start/stop cycles for reliable performance and productivity Exclusive lost load protection system Extra safety with exclusive lock out-tag out device that makes the balancer inoperable in the event of damage or required maintenance Unique pressure compensated flow control maintains lifting speed regardless of fluctuations in plant air pressure Chain lift eliminates spinning or fraying plus delivers long wear life 18 pocket liftwheel for smooth balancer operation True vertical chain travel (80" max.) Ergonomic pendant control station Forged steel latch type lower hook with bearing for free rotation Supplied complete with chain container for loose end chain Optional Series 0980 low headroom trolley to operate 25⁄8" through 55⁄8" flange beams Optional Latchlok hook Optional balance control for full 8 feet float capabilities Operates on 90P.S.I. plant air, not 100 P.S.I. like comparable units Made in U.S.A.