Metal Screw and Post used on all Budd cars and some freight cars. (4 pieces of each).
Convert your freight and passenger cars to either rigid jaw couplers that mate perfectly with Micro-Trains Couplers or buy a new set of trucks or just truck frames with authentic Micro-Trains working Jaw Couplers.
All Con-Cor freight and Passenger trucks use an axle length of 0.560 +/- .005 inches. This has been true for almost 40 years, so you can convert any old-production Con-Cors by recycling your Con-Cor wheelsets and buying only new truck frames if you so choose.