How to change couplers

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I just purchase a new Bachmann locomotive and it has knuckle couplers on it.  Included in the case are rapido couplers, how do I switch them?

[ericw95]

the instructions should contain a diagram of how to disassemble the rear truck and the pilot; just swap out the rapidos for the knuckle coupler and you should be good to go. Remember to keep the spring in position when switching out the couplers.