Notice I lingered while camera was aimed at the Wiard wheel, since the "field repairable" wheels were one of Wiard's big selling points. Look at how they are constructed, if a spoke or felloe is damaged in action, you can take it out with just a wrench, and put new parts in.
I doubt if the Army was as interested in that as mega-pamphleteer Wiard was. If you have never read any of the totally bombastic stuff he wrote during the War, you should. He was a real PITA for both the Army and Navy, and was a major instigator of the Congressional Committee on the Conduct of the War, which "put down" Dahlgren, Rodman, and many others. William Wheeler Hubbell was the other major instigator. You could spend more than a lifetime studying all the drama and legal actions that took place on account of ordnance development and procurement during the Civil War.