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The slack is taken out by tightening the screw link until the buffers make good contact - this can cause problems on very sharp curves (in industrial or dock areas) but they can be loosened off if needed. It's not dissimilar to the use of a turnbuckle adjuster as part of a securing chain for a machine load. The fun (if you can call it that!) was with the old 3-link couplers which had no adjuster. Goods trains so fitted tended to run at 25mph or less, and the guard would be expected to keep the train stretched using the brakes on his van to avoid snatching.
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