3/4 MCB knuckle couplers, 1:20.3 F scale pin-operated
thingiverse
This is a completely remodeled coupler, sized based on the 3/4 MCB coupler in F scale. They are compatible with Kadee #1 couplers and will fit in those boxes. The pins are designed to accept a small piece of Kadee centering spring in the top of the coupler to force the pin downward. Some cleanup of the holes is usually required after printing and I've been using 16Ga brass wire to make the knuckle pins. https://cad.onshape.com/documents/dd66edbdc078c51530011ce2/w/01b6e504764cec8dd282bd8b/e/3ef44672b1ff8c782692761c
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