The Kadee coupler conversion is fairly simple. There is typically a set of parts in the box that has the correct bolsters to mount Kadee couplers along with a 2R front pilot with a smaller opening for the coupler. I don't know about the F3s only because I only have 2r rail versions of that. My PAs which I got in both 2 and 3 rail had the extra parts in the 3 rail box.
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