updates /
Help - Vintage HO Mantua Derrick Car with No-Slot Screw - Model Railroader Magazine
Yes, click on literature, scroll down through all of the manufacturers and click on Mantua, when that opens, the middle box, "instructions/part numbers", open the drop down box, click on freight cars, when that page opens, the box on the right, "freight car diagrams", scroll to find "Derrick car 1962". There are two pages, you have to open each one individually. The first page is literature and part numbers, the second page is the "exploded" view.
HOSeeker has a lot of info, once you learn how to navigate it.
Mike.