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#5s, with the centering spring (litle copper coloured thing) and the box (a two part black plastic piece) are generally not assembled any further to account for a wide variety of applications. The coupler itself is assembled, and can sometimes be dropped in as a replacement. E.g. Proto2000 magnetic couplers - they use the same centering spring and box, so those parts are not needed. Sometimes just the coulper and centering spring are needed, as when replacing horn-hook types that come on Athern blue-box specials. The box is generally molded on in the right spot to just drop the other components in. Sometimes you need all the parts if you are upgrading something like a Tyco boxcar, which usually had a truck mounted coupler. In that case, you would need to cut off the truck mounted coupler, and install the box, centering spring, and the coupler to complete the conversion. Hope that clarifies things for you..! Andrew
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