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ON my Athearn Sd9's, I drilled and tapped the hole on the coupler mounting pad for 2-56 screws. I then filed the pad down with a dremel and a file. This takes alot of patience and test fitting. You have to file evenly and keep the pad parallel to the rails. Keep your coupler height guage handy and test fit as you go. Be careful not to file off too much. I used #5 boxes on my SD9 units but you could use the 30 series boxes. They may be better to use. I use 30 series boxes on all the other Athearn units when using the frame mounts. I have body mounted the couplers in 30 series boxes on most of my Athearns since I have put plows on them. The ones that do not have plows are still frame mounted.
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