Lionel Coal Car Dump Sled

My father purchased an Lionel coal dump car off of eBay and the car was broken on arrival. Rather than buying another or returning it to the seller he decided to ask me to fix the car with my 3D-Printer. The coal car is spring loaded and dumps the contents of the car when triggered by the engineer. A plunger holds the hopper in place and is pulled out of the way by an electromagnet in the track. Once the plunger is pulled down, the spring pushes the hopper up which pivots on a hinge. One of the