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Noah - I don't undersand you're comment about 2-56 screws being too small. This is what I've been using very successfully. I am assuming you are using Kadee #5 couplers and draft boxes? <br /> <br />I pre-assemble the coupler in the box, then carefully align the the box along the dead centre of the car and mark the position through the main hole in the centre of the box. I drill down through the floor of the car with a #50 drill, holding the drill in a pin vice. I tap the hole 2-56 and attach the pre-assembled box. At this point I check the coupler height carefully and add shims to the top of the box or washers to the truck bosses as appropriate. If the box is twisting because its not tight against the centre beam of the car I add a tiny drop of CA round the back of the box away from any moving parts. This way the 2-56 screw holds the lower portion of the box on and by removing the screw you can get inside the box to lubricate or replace the centering spring in the future. <br /> <br />If you're feeling really good, or for some reason you can't drill and tap 2-56 on the centre line of the car you can drill and tap 0-80 through each of the side mounting lugs.
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