I am packing away stuff getting ready to move. I've got an Aristo SD45 that won't quite fit into my storage container. If I remove the couplers, it should fit. I removed the screw that holds the coupler in place, but it won't slide off the post. I removed the two screws that hold the front part of the engine on to lower it enough to slide the coupler off. It's all loose, but I can't get it to come off. It's like there is still something holding it in the area of the little flip down walkway in the middle. I cannot see any kind of screw or hook or latch or anything to prevent it from moving. I'm hoping someone has changed couplers on one of these things and knows how it comes apart without breaking anything.