Closer look into 2nd hand Uncouplers from Marklin part number 8597 and 8587. When using second hand market, these uncouplers are unreliable. YOu dont know what happen to them before. As there are hard to refurbish and repair. I would avoid buing them 2nd hand if you dont have chance to test them or at least look under the cover. Check for rust and smooth running of the lifter up and down.

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